<prompt> An 18 years female complaining of breathlessness fainting and tingling sensation over lips. She has history of similar episodes in past. What is the diagnosisMyocardial infarctionARDSUpper respiratory tract infectionHyperventilation  <response>: Answer- D. HyperventilationTingling around mouth over lips is seen in hyperventilation due to hypocalcemia.Symptoms of hyperventilation include-Abdominal symptoms due to swallowing of excess air: bloating, burping, excessive flatusCNS symptoms due to dcrease PCO2: weakness,fainting confusion, dizziness, restlessness, anxiety, panic attack.Due to hypocalcemia: numbness tingling around mouth in limbs, corpopedal spasm, muscle twiching, tetanyChest symptoms : chest pains, shoness of breath breathlessness, wheezing, tachypnea. 