General weakness is just a symptom. There are many reasons for general weakness, such as some systemic diseases (such as hyperthyroidism, diabetes, urogenital inflammation, etc. ), psychological problems (such as depression) and so on. It may also be yin deficiency of liver and kidney,

Suggestion: If the body is thin, the spleen and stomach may be weak, and the spleen dominates the limbs, which will cause weakness and lack of energy. In addition, autonomic nervous disorder or exophthalmos goiter can also lead to general weakness. I suggest you go to the hospital for a check-up.