Long-term loose stools (thin and unformed feces) in middle-aged and elderly men are not necessarily due to kidney yang deficiency, but may also be due to spleen deficiency and dampness. 1. Kidney-Yang deficiency: Middle-aged and elderly men with deficiency of kidney qi and kidney yang (lack of yang energy in the kidneys) may cause loose stools. If, in addition to loose stools, there are symptoms such as coldness (fear of cold, cold limbs), long and clear urine, edema, impotence and premature ejaculation, etc., it may be due to kidney yang deficiency. 2. Spleen deficiency and dampness: Long-term dietary disorders can lead to weakness of the spleen and stomach, and dampness and turbidity can arise within the body, which may cause loose stools. If, in addition to loose stools, there are symptoms such as dullness (lack of appetite, reduced food intake), indigestion, diarrhea, sticky stools, eczema and itching in the lower body, it may be due to spleen deficiency and dampness. Kidney-Yang deficiency or Spleen-Dampness deficiency in middle-aged and old men may cause long-term loose stools. Please go to the regular hospital for consultation if you feel sick in daily life, and do not take medication on your own, so as to avoid incorrect medication and delay of the condition.