Tingling in the left chest near the armpit in bursts may be the discomfort caused by muscle strain, or it may be the symptoms caused by pleurisy, intercostal neuritis and other diseases. 1. Muscle strain: Regular lifting and pulling of heavy objects or strenuous exercise of the upper limbs may cause muscle strain in the left chest near the armpits, which may cause paroxysms of tingling, and may lead to acidity, swelling, fatigue and other undesirable symptoms, and the discomfort will be aggravated after strenuous activities. 2. Pleurisy: pleurisy may lead to paroxysmal tingling in the left chest near the armpit, patients may experience chest tightness, fatigue, shortness of breath and other adverse symptoms, some patients may experience coughing, which may lead to severe respiratory distress. 3. Intercostal neuritis: Intercostal neuritis may cause paroxysmal tingling in the left chest near the armpit, burning sensation and other adverse symptoms, severe coughing or large-scale movements will make the pain more intense, some patients will have fever. There are many reasons for such adverse symptoms, it is recommended to go to the hospital for relevant examinations to confirm the cause of the disease and actively cooperate with the doctor for treatment.