medical term for general body weakness?, The medical term for general weakness of the body is “asthenia”. Asthenia is a condition in which a person experiences a general feeling of weakness, fatigue and lack of energy throughout the body. This can be due to a variety of causes, such as infection, hormonal imbalance, emotional stress, chronic illnesses, or medication side effects. It is important to identify and treat the underlying cause of asthenia so that the person can regain their energy levels and overall health. If you suffer from persistent body weakness, always consult a medical professional for proper diagnosis and treatment.