Trichinosis Symptoms: Early Warning Signs and Progression

Trichinosis (trichinellosis) is a parasitic disease caused by eating raw or undercooked meat infected with Trichinella larvae. Symptoms appear in two phases, varying from mild to life-threatening.

Phase 1: Intestinal Phase (1–2 days post-infection)

• Gastrointestinal distress: Abdominal pain, diarrhea, nausea, vomiting
• Fever: Often the first sign, can reach 104°F (40°C)

Phase 2: Muscle Invasion Phase (2–8 weeks post-infection)

• Muscle pain (myalgia): The hallmark symptom—often severe, affecting breathing, chewing, and movement
• Periorbital edema: Characteristic swelling around the eyes, sometimes with conjunctivitis
• Fever and chills: Persistent or recurring
• Headache
• Extreme weakness/fatigue: Can impair walking
• Skin rash: Hives or maculopapular eruption
• Neurological symptoms: Confusion, coordination problems; in severe cases, meningitis, encephalitis, or coma

When to Seek Care

See a doctor immediately if you develop these symptoms after consuming undercooked pork, wild game (bear, boar), or other potentially infected meat. Early treatment with antiparasitics (albendazole/mebendazole) reduces severity. Diagnosis involves blood tests (eosinophilia, serology) and sometimes muscle biopsy.