A relapse in typhoid fever can occur in about 5–10% of cases, usually within 2 to 3 weeks after recovery, even after completing antibiotics. It happens when some Salmonella typhi bacteria remain dormant in the body and become active again. Common signs of relapse include the return of fever, fatigue, headache, abdominal pain, or mild diarrhea, though symptoms are often milder than the first episode. If any of these appear, it’s important to see a doctor promptly for follow-up tests and treatment. With timely medical care, relapses are easily managed, and full recovery can be achieved without complications.