What Are the Symptoms of Lyme & Babesia Co-Infection?

If you have been diagnosed with Babesiosis or are experiencing symptoms after a tick bite, you might be wondering if you could also have Lyme disease. Because both infections are transmitted by the same type of tick (the deer tick, or Ixodes scapularis), co-infection is remarkably common ^[1][2]. In fact, research shows that approximately 40% of patients with Babesiosis in the United States are also infected with another tick-borne illness, with Lyme disease being the most frequent ^[3].

When these two infections occur together, they can influence the severity of your symptoms and complicate your recovery ^[4][5]. Recognizing the overlapping symptoms—as well as the signs unique to each infection—is crucial for getting the right tests and the right care.

Overlapping Symptoms

Lyme disease and Babesiosis share many early, flu-like symptoms. Because of these similarities, having both infections can make you feel significantly worse than having either one alone ^[4][6]. If you have a co-infection, you may experience intense and prolonged versions of:

• Extreme fatigue: A profound exhaustion that does not improve with rest.
• Fevers and chills: High body temperatures often accompanied by shivering.
• Muscle and joint aches: Widespread pain or stiffness without an obvious cause.
• Headaches: Persistent or severe head pain.

Signs Unique to Babesiosis

While Lyme disease is caused by bacteria, Babesiosis is caused by a microscopic parasite that infects and destroys red blood cells, a process called hemolysis ^[7][8]. This leads to specific symptoms that are not typical of Lyme disease:

• Air hunger: A distressing sensation of shortness of breath, or the feeling that you cannot take in enough air (dyspnea on exertion) ^[9][10].
• Drenching sweats: Severe, sudden sweating that can soak through your clothes and sheets, often occurring at night.
• Dark urine: Urine that appears dark brown or tea-colored, which is a direct result of red blood cell destruction ^[9][7].
• Jaundice: A yellowing of the skin and the whites of your eyes (scleral icterus) ^[9][8].

Signs Unique to Lyme Disease

The most distinctive symptom of Lyme disease is the Erythema migrans rash ^[11]. While it is famous for appearing as an expanding “bullseye” pattern, it most commonly appears as a uniformly expanding red patch without central clearing. If you see this rash alongside symptoms like air hunger or drenching sweats, it is a strong indicator that you may be dealing with a co-infection ^[11].

Because not everyone with Lyme disease develops a rash, it is important to watch for other symptoms that are more characteristic of Lyme disease than Babesiosis, such as:

• Nerve pain: Sharp, shooting pains or tingling sensations.
• Facial palsy: A sudden drooping on one or both sides of the face.
• Severe joint swelling: Pain and swelling, particularly in large joints like the knee.

Why Comprehensive Testing is Essential

Lyme disease and Babesiosis require entirely different treatments—Lyme disease is treated with antibiotics, while Babesiosis requires anti-parasitic medications. For this reason, diagnosing a co-infection accurately is essential for a full recovery. An ordinary Lyme disease test will not detect Babesiosis, and vice versa.

If you suspect a tick-borne illness or live in an area where deer ticks are common, it is important to discuss comprehensive tick testing with your doctor. This can also help rule in or out other local tick-borne illnesses, such as Anaplasmosis. A comprehensive panel should include:

• Tests for Lyme disease: Usually a two-step blood test looking for antibodies.
• Tests for Babesiosis: This can include a peripheral blood smear (where a lab technician visually looks for the parasite inside your red blood cells under a microscope) ^[12][13], and Polymerase Chain Reaction (PCR) testing (which detects the parasite’s DNA in your blood) ^[14][15].
• A Complete Blood Count (CBC): Co-infections can often be flagged by unusual blood abnormalities, such as anemia (low red blood cell count) or thrombocytopenia (low blood platelet count) ^[6][16].

Discuss your complete symptom picture with your doctor, making sure to highlight any specific signs like air hunger or severe sweats, as these are critical clues that point beyond Lyme disease alone.