According to your illness, I think 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.

Guiding opinions:

It may also be yin deficiency of liver and kidney. If the body is thin, the spleen and stomach may also be weak. Spleen governs limbs, and weakness of spleen and stomach will cause weakness of limbs 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. I wish you a speedy recovery.