Fainting due to moxibustion refers to the extreme response symptoms such as sudden dizziness, pale complexion, vertigo, nausea, sweating, palpitation, cold extremities, and a drop in the blood pressure during the moxibustion. In severe cases, there might be loss of consciousness, with stumbling, purple lips and nails, incontinence of urine and stool, profuse sweating and a weak pulse.