The lack of strength in the legs after morning stools may be related to dehydration, postural hypotension, electrolyte disorders, hemorrhagic anemia and other diseases. 1. Dehydration: If the number of bowel movements is high, mainly dilute watery stools, due to the loss of excessive water, there will be varying degrees of dehydration. Mild cases show weakness of limbs, fatigue and weakness, dizziness and headache, nausea, etc.; in severe cases, thirst, facial flushing, dry skin and mucous membranes, restlessness, etc.; in critical cases, shock may occur. 2. Postural hypotension: due to the change of body position before and after defecation, postural hypotension is easy to occur when standing up suddenly; due to insufficient blood supply to the cerebrovascular vessels, it will show transient dizziness, nausea, fatigue, blurred vision and so on. 3. Electrolyte disorders: If the stools are more frequent and larger in volume, it will be accompanied by the loss of various electrolytes, such as potassium, sodium, chloride, calcium, magnesium, and the occurrence of electrolyte disorders, such as hyponatremia, can be manifested as generalized fatigue, limb weakness, nausea and so on. 4. Hemorrhagic anemia: If there is blood in the stool and the amount is large, due to excessive blood loss will lead to anemia, which can be manifested as limb weakness, general weakness, dizziness; further hemorrhagic shock, manifested as fuzzy consciousness, pulse arrhythmia, and so on. The cause of the patient’s legs after the morning bowel movement may also be neurological disorders, if the symptoms are serious, or continue to see no improvement, it is recommended to go to the regular hospital in a timely manner, clear cause, under the guidance of the doctor for targeted treatment.