Is it a good sign to have loose or watery stools after moxibustion?
Generally speaking, whether having loose stools or diarrhea after moxibustion is a positive sign depends on specific symptoms, body constitution, and duration. The detailed analysis is as follows:

If you inherently have a damp-heat or phlegm-damp constitution, experiencing mild diarrhea or loose stools within 1–2 days after moxibustion—without discomfort such as abdominal pain or fatigue—and feeling physically lighter after bowel movements is usually a good sign. The warming effect of moxibustion can enhance intestinal motility and help expel dampness and waste from the body, representing a normal response during the body's regulation process. This typically resolves spontaneously within 2–3 days.
However, if loose stools or diarrhea persist for more than three days after moxibustion, accompanied by symptoms such as abdominal pain, bloating, nausea, or fatigue, or if you have a spleen-stomach deficiency-cold constitution and were exposed to cold immediately after treatment, this is not beneficial. It may indicate excessive stimulation from moxibustion or invasion of cold pathogens leading to intestinal dysfunction, which could damage the spleen and stomach if prolonged.
Avoid consuming raw or cold foods immediately after moxibustion, keep your abdomen warm, and drink plenty of warm water to stay hydrated. Maintain a light and easily digestible diet, minimizing intake of greasy and spicy foods. If symptoms persist, discontinue moxibustion and monitor your condition; seek medical advice promptly if necessary.