I'm losing much more hair after recovering from dengue. Is it permanent?

Heavy hair shedding two to three months after a high fever or illness is common. It is called telogen effluvium and is usually temporary, improving over three to six months as new hair grows. Eat enough protein, and ask your doctor whether iron, vitamin D or thyroid tests are needed. Avoid harsh treatments in the meantime. See a dermatologist if the shedding continues beyond six months, or if you notice bald patches, scalp itching or scaling.