Excess of physical exertion may precipitate facial and eye muscle spasm. It can be due to muscle fatigue. Side effects of certain medicines can produce facial twitching. Drinking excess of coffee, or any other caffeinated drinks can cause involuntary twitching of muscles, facial muscles are one of them.
Blood and organ donors are screened in many endemic areas and, since 2006, in the US to prevent transfusion- and organ transplantârelated Chagas disease. Key Points Chagas disease is caused by Trypanosoma cruzi, which is transmitted by Triatominae (reduviid, kissing, or assassin) bugs. Infection is endemic in South and Central America and Mexico; an estimated 8 million people worldwide, including an estimated 300,000 people in the US (primarily immigrants), are infected.
Key facts. 1  About 6 million to 7 million people are estimated to be infected worldwide, mostly in Latin America. 2  Vector-borne transmission occurs in the Americas. 3  Chagas disease was once entirely confined to the Region of the Americas â principally Latin America â but it has now spread to other continents. 4  The disease is curable if treatment is ...