VHOSPITAL.CLINIC · Parasite-Related Symptom
Severe myalgia is the hallmark of the muscle invasion phase of trichinellosis. Trichinella spiralis larvae migrate from the intestine and encyst in striated muscle fibres — particularly the diaphragm, masseter, tongue, and extraocular muscles — causing intense pain.
Larvae penetrate muscle cells, inducing a nurse cell complex and inflammatory infiltrate of eosinophils and macrophages. The inflammatory process within muscle fibres generates the intense pain, oedema, and weakness characteristic of the systemic phase.
Related perspective
Muscle Pain Caused by Trichinellosis — Symptom-first view →Trichinellosis affects the body in multiple ways. Beyond muscle pain, patients commonly experience:
Confirming Trichinellosis as the cause of muscle pain:
The most affected muscles are those used constantly: diaphragm (breathing), masseter (chewing), tongue, biceps, and extraocular muscles. Periorbital oedema from extraocular muscle involvement is a classic sign.
Without treatment, muscle pain peaks 2–4 weeks after infection and may persist for months as larvae encyst. With mebendazole treatment started early, symptoms resolve significantly faster.
Yes. It mimics polymyositis, influenza, and dermatomyositis. The key distinguishing features are: elevated eosinophils, periorbital oedema, and dietary history of undercooked meat.
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