Common symptoms of lactic acidosis include dryness of the mucous membranes of the mouth and lips, nausea, accelerated breathing, fatigue, dizziness, and weakening of the muscles of the limbs. Lactic acidosis is a type of disease in which lactic acid circulation is impaired by various causes and blood lactic acid level is elevated in the body. Common causes include sepsis, organ failure, shock and other clinically critical illnesses, as well as inappropriate application of drugs such as phenelzine. In early mild cases, patients may show signs of dehydration such as dry lips and mucous membranes, decreased urine output, slightly accelerated respiration, fatigue, dizziness, nausea, drowsiness, etc. In severe cases, there may be symptoms such as sunken orbits, bruised and purplish lips, weakened limb muscle strength, and coma. If lactic acidosis occurs, it is recommended that the patient consult a doctor promptly for early treatment and use medication as prescribed by the doctor to minimize the damage to all organs of the body.