Skip to content
How It Works
Explore
Ask a Question Resources Pricing
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Ask a Question
PubMed This is a summary of 24 peer-reviewed journal articles Updated
Neurology

Symptoms, Subtypes, and Emergency Red Flags

At a Glance

Diabetic neuropathy can cause numbness, pain, weakness, dizziness, digestive changes, or no symptoms at all. Gradual symptoms need routine care, but a cold or discolored foot, sudden weakness, stroke signs, severe infection, or unusual heart symptoms need urgent help.

Diabetic neuropathy is not a single condition; it is a family of nerve disorders that can affect different parts of your body in different ways. Some people have nerve damage without any symptoms at all. While the most common type causes numbness in the feet, other types can affect your heart, digestion, or specific muscles in your legs.

Understanding where your symptoms are located and how they started helps your care team determine which subtype you have and how to manage it.

The Four Main Subtypes

Neuropathy can occur in several patterns, though many people are asymptomatic. Most people with symptomatic diabetic neuropathy will experience symptoms that fit into one of these four categories:

1. Distal Symmetric Polyneuropathy (DPN)

This is by far the most common form [1]. It is “symmetric,” meaning it usually affects both sides of the body in a relatively similar pattern (like both feet). It is “length-dependent,” meaning the longest nerves are affected first.

  • Location: Usually starts in the toes and feet, eventually moving up to the calves and hands (the “glove-and-stocking” pattern) [2].
  • Symptoms: Numbness, tingling, or “pins and needles.” You may also feel burning, sharp electric-like pains, or a dull ache [3].

2. Autonomic Neuropathy

This type affects the nerves that control your involuntary “autopilot” functions, like your heart rate and digestion [4].

  • Cardiovascular: You might feel dizzy or faint when standing up (orthostatic hypotension) or notice your heart rate doesn’t change much when you exercise [5][6].
  • Digestive & Urinary: This can cause bloating, constipation, diarrhea, or difficulty emptying your bladder [7].
  • Sweating: You might notice you sweat excessively after eating or, conversely, that your feet no longer sweat at all, making the skin dry and cracked [8].

3. Proximal Neuropathy (Diabetic Amyotrophy)

Unlike DPN, this type affects nerves closer to the center of your body.

  • Location: Usually the hips, buttocks, or thighs, often on just one side [9].
  • Symptoms: Sudden, severe pain in the thigh or hip followed by muscle weakness and wasting (thinning of the muscle) [10]. While painful, most people see some improvement over time, though recovery can be incomplete and take longer than 18 months [9].

4. Focal or Multifocal Neuropathy (Mononeuropathy)

This involves damage to a single specific nerve or a small group of nerves [11].

  • Location: Can occur in the wrist (like Carpal Tunnel Syndrome), the torso, or the nerves controlling eye movement [10].
  • Symptoms: Sudden weakness or pain in a very specific area [12]. Note: sudden weakness can be a medical emergency.

🛑 Urgent Action and Red Flags

While ordinary nerve pain is not usually a medical emergency, certain complications require immediate action to protect your life or your limbs. Use this guide to know who to call and when.

🚨 Seek EMERGENCY Care (Go to the ER or Call 911) If:

  • Acute Limb Ischemia: Your foot suddenly turns blue, black, very pale, or ice-cold, especially if accompanied by new severe pain, numbness, weakness, or an absent pulse. Do not wait for a specialist [13][14].
  • Stroke Warning Signs: You have a sudden facial droop, speech difficulty, a dropped wrist, severe new imbalance, sudden weakness on one side of your body, or sudden double vision. Do not assume these are just diabetic neuropathy [15].
  • Signs of Sepsis: You have a foot ulcer or infection and develop a fever, chills, confusion, rapid breathing, or a very fast heart rate [16][17].
  • Silent Heart Symptoms: Because neuropathy can dull pain, you might not feel “chest crushing.” Seek help for sudden unexplained shortness of breath, extreme fatigue, nausea, or profuse sweating during activity [15][18].

⚠️ Call for a SAME-DAY Specialist Review If:

  • The “Hot, Red, Swollen Foot” (Charcot Foot): If one foot becomes suddenly red, warm, and swollen—even if it doesn’t hurt much—you must stop walking on it immediately and see a specialist [19][20]. This may be Charcot Neuroarthropathy, where bones in the foot can weaken and fracture [21].
  • Severe Infection: You notice pus draining from a wound, a foul odor, or redness that is spreading rapidly up your leg [22].
  • A New Ulcer: Any new break in the skin, blister, or “hole” on your foot should be seen by a professional within 24 hours, even if it is painless [23][24].

📅 Schedule a ROUTINE Visit For:

  • Gradual worsening of numbness or tingling.
  • Burning pain that interferes with your sleep.
  • New symptoms of dizziness or digestive changes.

Common questions in this guide

What are the four types of diabetic neuropathy?
The main patterns are distal symmetric polyneuropathy, autonomic neuropathy, proximal neuropathy, also called diabetic amyotrophy, and focal or multifocal neuropathy. They differ by the nerves they affect, so symptoms may involve the feet and hands, automatic body functions, the hips and thighs, or one specific area.
What does typical diabetic peripheral neuropathy feel like?
The most common form usually causes similar symptoms on both sides, starting in the toes and feet and sometimes moving toward the calves and hands. Numbness, tingling, burning, electric-like pain, or an ache may occur, although some people have no symptoms.
When should a diabetic foot problem be treated as an emergency?
Call 911 or go to the ER if a foot suddenly becomes blue, black, very pale, or ice-cold, especially with severe pain, numbness, weakness, or no pulse. Emergency care is also needed for sudden facial drooping, trouble speaking, one-sided weakness, severe new imbalance, symptoms of sepsis, or unexplained shortness of breath with extreme fatigue, nausea, or heavy sweating during activity.
What should I do if one foot becomes hot, red, and swollen?
Stop walking on the foot and arrange a same-day specialist assessment, even if it does not hurt much. This pattern can be Charcot neuroarthropathy, in which foot bones may weaken and fracture.
How quickly should a new blister or ulcer on my foot be checked?
A new break in the skin, blister, or hole should be evaluated by a healthcare professional within 24 hours, even if it is painless. Numbness can hide an injury or infection, so do not wait for pain before seeking care.
Can diabetic neuropathy cause dizziness or digestive and bladder problems?
Yes. Autonomic neuropathy can affect automatic functions and may cause dizziness or faintness when standing, bloating, constipation, diarrhea, difficulty emptying the bladder, or changes in sweating.
Can diabetic neuropathy hide heart or circulation problems?
It can reduce or change pain signals, so some serious problems may not feel like expected chest or foot pain. Sudden shortness of breath, extreme fatigue, nausea, or heavy sweating during activity needs emergency evaluation, and a clinician may decide whether vascular or cardiac testing is appropriate.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Does the pattern of my symptoms match what you would expect for typical diabetic neuropathy?
  2. 2.Based on my exam today, do I have any signs of 'silent' issues like poor circulation or heart-rate changes I might not feel?
  3. 3.If I notice a new red spot or blister on my foot that doesn't hurt, should I call your office or go to a specialized foot clinic immediately?
  4. 4.Given my risk factors, should we schedule a formal clinician-performed vascular assessment to check my circulation?
  5. 5.Do my autonomic symptoms or cardiovascular risk factors warrant targeted cardiac screening?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (24)
  1. 1

    Lumos for the long trail: Strategies for clinical diagnosis and severity staging for diabetic polyneuropathy and future directions.

    Himeno T, Kamiya H, Nakamura J

    Journal of diabetes investigation 2020; (11(1)):5-16 doi:10.1111/jdi.13173.

    PMID: 31677343
  2. 2

    Diabetic peripheral neuropathy essentials: a narrative review.

    Chang MC, Yang S

    Annals of palliative medicine 2023; (12(2)):390-398 doi:10.21037/apm-22-693.

    PMID: 36786097
  3. 3

    Diabetic peripheral neuropathy: pathogenetic mechanisms and treatment.

    Zhu J, Hu Z, Luo Y, et al.

    Frontiers in endocrinology 2023; (14()):1265372 doi:10.3389/fendo.2023.1265372.

    PMID: 38264279
  4. 4

    Spectrum of diabetic neuropathies.

    Sasaki H, Kawamura N, Dyck PJ, et al.

    Diabetology international 2020; (11(2)):87-96 doi:10.1007/s13340-019-00424-7.

    PMID: 32206478
  5. 5

    Effect of Gabapentin on Heart Rate Variability in Patients with Painful Diabetic Peripheral Neuropathy: A Double-blinded Randomized Controlled Trial.

    Ahmadi F, Vasheghani M, Moradi M, et al.

    Iranian journal of pharmaceutical research : IJPR 2025; (24(1)):e165080 doi:10.5812/ijpr-165080.

    PMID: 41234388
  6. 6

    Diabetes and cardiac autonomic neuropathy: Clinical manifestations, cardiovascular consequences, diagnosis and treatment.

    Balcıoğlu AS, Müderrisoğlu H

    World journal of diabetes 2015; (6(1)):80-91 doi:10.4239/wjd.v6.i1.80.

    PMID: 25685280
  7. 7

    Autonomic neuropathy and urologic complications in diabetes.

    Agochukwu-Mmonu N, Pop-Busui R, Wessells H, Sarma AV

    Autonomic neuroscience : basic & clinical 2020; (229()):102736 doi:10.1016/j.autneu.2020.102736.

    PMID: 33197694
  8. 8

    Treating Diabetic Neuropathy: Present Strategies and Emerging Solutions.

    Javed S, Alam U, Malik RA

    The review of diabetic studies : RDS 2015; (12(1-2)):63-83 doi:10.1900/RDS.2015.12.63.

    PMID: 26676662
  9. 9

    Diabetic Amyotrophy (Bruns-Garland Syndrome): A Narrative Review.

    Agarwal A, Srivastava MVP, Vishnu VY

    Annals of Indian Academy of Neurology 2022; (25(5)):841-844 doi:10.4103/aian.aian_239_22.

    PMID: 36561022
  10. 10

    Diabetic Neuropathy Part 2: Proximal and Asymmetric Phenotypes.

    Davalos L, Pasnoor M, Dimachkie MM, Barohn RJ

    Neurologic clinics 2025; (43(4)):693-710 doi:10.1016/j.ncl.2025.05.007.

    PMID: 41161991
  11. 11

    Entrapment neuropathies in diabetes mellitus.

    Rota E, Morelli N

    World journal of diabetes 2016; (7(17)):342-53 doi:10.4239/wjd.v7.i17.342.

    PMID: 27660694
  12. 12

    Advancing the Diagnosis of Diabetic Neuropathies: Electrodiagnostic and Skin Autofluorescence Methods.

    Trofin D, Salmen BM, Salmen T, et al.

    Journal of personalized medicine 2024; (14(8)) doi:10.3390/jpm14080884.

    PMID: 39202075
  13. 13

    Global Vascular Guidelines on the Management of Chronic Limb-Threatening Ischemia.

    Conte MS, Bradbury AW, Kolh P, et al.

    European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery 2019; (58(1S)):S1-S109.e33 doi:10.1016/j.ejvs.2019.05.006.

    PMID: 31182334
  14. 14

    The intersocietal IWGDF, ESVS, SVS guidelines on peripheral artery disease in people with diabetes and a foot ulcer.

    Fitridge R, Chuter V, Mills J, et al.

    Diabetes/metabolism research and reviews 2024; (40(3)):e3686 doi:10.1002/dmrr.3686.

    PMID: 37726988
  15. 15

    Prevalence and determinants of silent myocardial ischemia in patients with type 2 diabetes in Cameroon: a cross-sectional study.

    Mfeukeu-Kuate L, Meyanui VA, Jingi AM, et al.

    The Pan African medical journal 2022; (42()):41 doi:10.11604/pamj.2022.42.41.34941.

    PMID: 35949456
  16. 16

    Diabetic Foot Infection Presenting Systemic Inflammatory Response Syndrome: A Unique Disorder of Systemic Reaction from Infection of the Most Distal Body.

    Lin CW, Hung SY, Huang CH, et al.

    Journal of clinical medicine 2019; (8(10)) doi:10.3390/jcm8101538.

    PMID: 31557854
  17. 17

    [Multidisciplinary management of diabetic foot ulcer infection].

    Blanchette V, Brousseau-Foley M

    La Revue de medecine interne 2021; (42(3)):193-201 doi:10.1016/j.revmed.2020.09.004.

    PMID: 33451819
  18. 18

    Autonomic neuropathy in diabetes.

    Tannus LRM, Cobas RA

    Archives of endocrinology and metabolism 2025; (70(special 1)):e250406 doi:10.20945/2359-4292-2025-0406.

    PMID: 41313194
  19. 19

    Charcot Foot: Clinical Clues, Diagnostic Strategies, and Treatment Principles.

    Marmolejo VS, Arnold JF, Ponticello M, Anderson CA

    American family physician 2018; (97(9)):594-599.

    PMID: 29763252
  20. 20

    A literature-based guide to the conservative and surgical management of the acute Charcot foot and ankle.

    Schade VL, Andersen CA

    Diabetic foot & ankle 2015; (6()):26627 doi:10.3402/dfa.v6.26627.

    PMID: 25795102
  21. 21

    Updates on Diabetic Foot and Charcot Osteopathic Arthropathy.

    Schmidt BM, Holmes CM

    Current diabetes reports 2018; (18(10)):74 doi:10.1007/s11892-018-1047-8.

    PMID: 30112582
  22. 22

    Diabetic Foot Infections in the Emergency Department.

    Frazee BW

    Emergency medicine clinics of North America 2024; (42(2)):267-285 doi:10.1016/j.emc.2024.01.003.

    PMID: 38641391
  23. 23

    Management of diabetic foot ulcers in the community: an update.

    Levy N, Gillibrand W

    British journal of community nursing 2019; (24(Sup3)):S14-S19 doi:10.12968/bjcn.2019.24.Sup3.S14.

    PMID: 30817189
  24. 24

    Diabetic Foot Ulcers: A Review.

    Armstrong DG, Tan TW, Boulton AJM, Bus SA

    JAMA 2023; (330(1)):62-75 doi:10.1001/jama.2023.10578.

    PMID: 37395769

This page is for informational purposes only and does not constitute medical advice. Contact a clinician for personalized guidance, and seek emergency care for sudden weakness, a cold or discolored foot, stroke signs, or possible sepsis.

Get notified when new evidence is published on diabetic neuropathy.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.