Beriberi
/ˌberiˈberi/
Definition 1 of 1
Pro Tip 1/3Medical Condition
Beriberi specifically refers to health-related issues, not general problems or difficulties. 
After months at sea, the sailors developed beriberi.
Pro Tip 2/3Technical Term
Used mainly in health and medical contexts, might be unknown in casual conversations. 
The doctor diagnosed the patient with beriberi due to poor diet.
Pro Tip 3/3Not Hunger
Beriberi is not caused by a lack of food, but rather by a lack of vitamin B1 in the diet. 
Even though he was eating regularly, he developed beriberi.