Feeling hot and weak but not feverish may be related to physiological factors such as excessive fatigue, or pathological factors such as viral colds and autonomic dysfunction. 1. Physiological factors: Physical weakness due to prolonged fatigue and lack of sleep may lead to fever but not fever. It is recommended to have more rest, live a regular life, go to bed early and get up early, don’t go to bed late and stay up late. 2. Pathological factors: (1) Viral cold: mainly caused by viral infection, cold, climate change, excessive fatigue is also easy to induce the disease, often showing nasal congestion, runny nose, fatigue, fever, etc., which may lead to feeling feverish and fatigue but not fever. (2) Autonomic dysfunction: mainly caused by psychological, mental and genetic factors, it often manifests dizziness, panic, breathlessness, etc., which may lead to feeling feverish and weak but not feverish. There may be other reasons for feeling hot and weak but not feverish, if the symptoms do not ease and have a tendency to aggravate, it is recommended to consult a doctor to find out the cause, follow the doctor’s instructions to standardize the use of medication, do not self-medication.