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PubMed This is a summary of 21 peer-reviewed journal articles Updated
Hematology

Recognizing the Signs: Common Symptoms of PV

At a Glance

Polycythemia vera (PV) causes the blood to thicken, leading to systemic symptoms. Common signs include severe itching after water contact, burning pain in the hands and feet, brain fog, profound fatigue, and night sweats. Tracking these symptoms regularly helps doctors optimize your treatment.

While the “thickening” of the blood in Polycythemia Vera (PV) happens deep within your bone marrow, the symptoms of the disease are often very visible and felt throughout the entire body. These symptoms occur because your blood has a higher-than-normal “viscosity,” meaning it is thicker and flows more slowly through your small blood vessels [1][2].

The Hallmark Itch: Aquagenic Pruritus

One of the most distinctive signs of PV is aquagenic pruritus—an intense itching, stinging, or prickling sensation that occurs after contact with water [3][4]. Unlike a typical dry-skin itch, this “water-itch”:

  • Is triggered by temperature changes or moisture: It most commonly happens after a warm bath or shower [5].
  • Shows no visible rash: The skin often looks completely normal, even though the sensation can be severe [6][7].
  • Can last for nearly an hour: It typically begins a few minutes after water contact and can be quite distressing [3].

Important note: Standard allergy pills (antihistamines) and moisturizing lotions often do not work for this specific type of itch [8][4]. This happens because water may trigger the release of inflammatory markers and stimulate sensitive nerve endings in the skin that are already “on edge” due to the underlying PV [5][9].

Burning Hands and Feet: Erythromelalgia

Some patients experience erythromelalgia, a condition that affects the small blood vessels in the extremities [10][11]. It is characterized by a “triad” of symptoms:

  1. Redness (erythema) [10].
  2. Burning pain [10].
  3. Increased skin temperature [10].

This usually affects the fingers, toes, or the soles of the feet. It is caused by tiny blood clots and changes in the vessel walls that block the flow of blood [12][13]. Many patients find that cooling the area or elevating their limbs provides temporary relief [14][15].

Neurological Symptoms and “Brain Fog”

When blood is thick and “sluggish,” it struggles to deliver oxygen efficiently to the brain and eyes. This can lead to several neurological and sensory symptoms [2][16]:

  • Brain Fog: A feeling of mental fatigue, difficulty concentrating, or “slow” thinking [2].
  • Headaches: Often described as a dull, heavy, or throbbing sensation [16].
  • Vision Changes: You may experience blurred vision, blind spots, or “flashing lights” (scintillating scotoma) as the thick blood moves through the delicate vessels of the eyes [2][17].

Constitutional Symptoms

PV is a systemic disease, meaning it affects the whole body. You may experience “constitutional symptoms”—general signs of illness that include [18][19]:

  • Fatigue: This is the most common symptom, often described as a profound exhaustion that isn’t cured by sleep [18].
  • Night Sweats: Drenching sweats that occur during sleep, often requiring a change of clothes or sheets [18].
  • Early Fullness: Feeling full quickly after starting a meal, which can happen if the spleen is enlarged and pressing on the stomach [18].

Tracking Your Symptoms: The MPN-SAF

Because symptoms can change slowly over time, doctors use a specialized tool called the MPN-SAF TSS (Myeloproliferative Neoplasm Symptom Assessment Form Total Symptom Score), often called the MPN-10 [18][19].

This is a simple 0-10 scale where you rate ten common symptoms, including fatigue, itching, and night sweats [18]. Using this tool regularly helps you and your doctor see if your treatment is working or if your disease is changing [20][21]. Tracking these scores allows you to advocate for yourself more effectively during appointments [18].

Common questions in this guide

Why do I itch so badly after a shower with Polycythemia Vera?
This symptom, called aquagenic pruritus, happens because water triggers the release of inflammatory markers and stimulates sensitive nerve endings in your skin. It causes intense prickling or stinging without a visible rash, and standard allergy pills often do not help.
What causes the burning sensation in my hands and feet?
Erythromelalgia is a condition where small blood vessels in your extremities become temporarily blocked by thickened blood and tiny clots. This causes redness, increased skin temperature, and a burning pain, typically in the fingers, toes, or soles of the feet.
Can Polycythemia Vera cause brain fog or headaches?
Yes, because PV makes your blood thicker, it moves more slowly through your blood vessels. This sluggish blood flow struggles to deliver oxygen efficiently to the brain, which can lead to mental fatigue, difficulty concentrating, and dull or throbbing headaches.
Why do I feel full so quickly when eating?
Early fullness happens when your spleen becomes enlarged, a common effect of Polycythemia Vera. The enlarged spleen presses against your stomach, leaving less room for food and making you feel full very quickly after starting a meal.
What is the MPN-10 symptom tracker?
The MPN-10 is a simple symptom tracking tool that helps you and your doctor monitor how your disease is affecting you over time. By rating ten common symptoms on a scale of 0 to 10, you can clearly see if your treatment is working or if adjustments are needed.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Am I experiencing 'brain fog' because my hematocrit is too high, or could there be another cause?
  2. 2.Is the burning sensation in my hands and feet (erythromelalgia) a sign that my current treatment needs to be adjusted?
  3. 3.Can we review my MPN-10 scores together to see how my symptoms have changed since our last visit?
  4. 4.What is the safest way for me to manage the intense itching after I shower or swim?
  5. 5.Are my vision changes a temporary symptom of thick blood, or do I need to see an eye specialist?

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 (21)
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    Polycythemia vera: 2024 update on diagnosis, risk-stratification, and management.

    Tefferi A, Barbui T

    American journal of hematology 2023; (98(9)):1465-1487 doi:10.1002/ajh.27002.

    PMID: 37357958
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    Increased plasma viscosity in plasma cell dyscrasia and whole blood viscosity in polycythemia vera.

    Shin DW, Gu JY, Kim JS, et al.

    Clinical hemorheology and microcirculation 2018; (70(1)):59-67 doi:10.3233/CH-170304.

    PMID: 29660912
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    Aquagenic Pruritus in Polycythemia Vera: Clinical Characteristics.

    Lelonek E, Matusiak Ł, Wróbel T, Szepietowski JC

    Acta dermato-venereologica 2018; (98(5)):496-500 doi:10.2340/00015555-2906.

    PMID: 29437189
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    Aquagenic Pruritus Questionnaire: Predicting Myeloproliferative Neoplasms in Patients with Aquagenic Pruritus.

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    Dermatology and therapy 2025; (15(12)):3593-3604 doi:10.1007/s13555-025-01548-2.

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  5. 5

    Rationale and design of the multicentric, double-blind, double-placebo, randomized trial APrepitant versus HYdroxyzine in association with cytoreductive treatments for patients with myeloproliferative neoplasia suffering from Persistent Aquagenic Pruritus. Trial acronym: APHYPAP.

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    Aquagenic cutaneous disorders.

    Wang F, Zhao YK, Luo ZY, et al.

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    Case of aquagenic urticaria: Case report and the results of histopathological examination.

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    The Journal of dermatology 2021; (48(1)):88-91 doi:10.1111/1346-8138.15615.

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    Naltrexone: a Novel Approach to Pruritus in Polycythemia Vera.

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    Idiopathic aquagenic pruritus: pathogenesis and effective treatment with atenolol.

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    The Journal of the Association of Physicians of India 2018; (66(5)):90-1.

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    Erythromelalgia Caused by Polycythemia Vera Combined with Primary Aldosteronism.

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    Erythromelalgia in patients with essential thrombocythemia and polycythemia vera.

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    Secondary erythromelalgia: a tryptophan dietary supplement-induced case associated with elevated 5-hydroxyindoleacetic acid (5HIAA) urinary levels.

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    Polycythemia vera as a rare cause of hypertension in a young man.

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    Cerebral intraparenchymal extramedullary hematopoiesis in polycythemia vera.

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    Acta neurologica Belgica 2020; (120(5)):1181-1183 doi:10.1007/s13760-019-01196-2.

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    Differences between aquagenic and non-aquagenic pruritus in myeloproliferative neoplasms: An observational study of 500 patients.

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This page is for informational purposes only and does not replace professional medical advice. Always consult your healthcare provider if you experience new or worsening symptoms of Polycythemia Vera.

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