Toxoplasmosis often causes no noticeable symptoms, but when they do appear they are usually mild, flu-like issues such as swollen glands, fever, headache, and muscle aches that can last for weeks to months. In people with weakened immune systems or in eye/brain involvement, symptoms can be more severe and include confusion, vision changes, and neurologic problems.

What toxoplasmosis is

Toxoplasmosis is an infection caused by the parasite Toxoplasma gondii , commonly acquired from undercooked meat, contaminated soil, or cat feces. Most healthy people clear the active infection, but the parasite can remain dormant in tissues and reactivate if immunity becomes weak.

Common symptoms in healthy people

In people with normal immune systems, symptoms are often absent or mild and self‑limited.

Typical toxoplasmosis symptoms can include:

  • Swollen or tender lymph nodes, especially in the neck
  • Mild fever or feeling hot
  • Headache
  • Muscle aches and body pains
  • Sore throat
  • Feeling tired or generally unwell

These flu‑like symptoms usually resolve over several weeks, though fatigue and aches can persist longer in some cases.

Eye and brain symptoms

When toxoplasmosis affects the eyes (ocular toxoplasmosis) or brain, symptoms are more serious.

Possible eye symptoms include:

  • Blurred or reduced vision
  • Eye pain, often worse with bright light
  • Redness and tearing of the eye

Neurologic symptoms, more likely in people with weakened immunity, can include:

  • Confusion or trouble thinking clearly
  • Headache that can be severe or persistent
  • Poor coordination or unsteady walking
  • Seizures or speech changes

Symptoms in people with weak immunity

People with HIV, those on chemotherapy, high‑dose steroids, or post‑transplant are at higher risk for severe disease.

They may develop:

  • High fever and severe headache
  • Confusion, personality changes, or seizures
  • Nausea, vomiting, or difficulty with balance
  • Worsening shortness of breath or heart symptoms if lungs or heart are involved

Pregnancy and toxoplasmosis

Many pregnant people with new toxoplasmosis infections have no or only mild flu‑like symptoms. The concern is that the parasite can cross the placenta and affect the fetus, sometimes causing miscarriage, stillbirth, or eye/brain problems in the baby.

Signs that need urgent medical review in pregnancy include:

  • Flu‑like illness after known exposure to cat feces or undercooked meat
  • New vision changes or severe headache
  • Any concerning symptoms after being told you have toxoplasmosis

Information gathered from public forums or data available on the internet and portrayed here.