Chagas disease can cause a sudden, brief illness (acute), or it may be a long-lasting (chronic) condition. Symptoms range from mild to severe, although many people don't experience symptoms until the chronic stage. Acute phase The acute phase of Chagas disease, which lasts for weeks or months, is often symptom-free. When signs and symptoms do occur, they are usually mild and may include: 
Swelling at the infection site
Fever
Fatigue
Rash
Body aches
Eyelid swelling
Headache
Loss of appetite
Nausea, diarrhea or vomiting
Swollen glands
Enlargement of your liver or spleen
 Signs and symptoms that develop during the acute phase usually go away on their own. In some cases, if the infection isn't treated, Chagas disease will advance to the chronic phase. Chronic phase Signs and symptoms of the chronic phase of Chagas disease may occur 10 to 20 years after initial infection, or they may never occur. In severe cases, Chagas disease signs and symptoms may include: 
Irregular heartbeat
Heart failure
Sudden cardiac arrest
Difficulty swallowing due to enlarged esophagus
Stomach pain or constipation due to enlarged colon
