The cause of a pins and needles sensation inside the left breast may be coronary heart disease, costochondritis, gastric ulcer, etc. You can take nitroglycerin, antibiotics, acid suppressants, etc. 1. If angina is caused by coronary heart disease, you can take nitroglycerin under the tongue. 2. In case of costochondritis or intercostal neuralgia, antibiotics can be taken to control the infection (cefuroxime, cefixime, cyclic erythromycin, levofloxacin tablets, etc.), and analgesic to relieve pain (diclofenac sodium tablets or diclofenac sodium cream). 3. If the stabbing pain is caused by gastric ulcer or duodenal bulb ulcer, acid-suppressing drugs and gastric mucosal protectants can be used (omeprazole, gefalcon, magnesium alumina carbonate tablets), and if Helicobacter pylori infection is detected, quadruple therapy should be used to eradicate the Helicobacter pylori bacteria (omeprazole, bismuth citrate potassium amoxicillin, clarithromycin). 4. If the tingling is caused by pneumonia, antibiotics can be taken to control the infection (cefixime, moxifloxacin, erythromycin, etc.). 5. If the stabbing pain is caused by mastitis, antibiotics (cefixime, ofloxacin, erythromycin, etc.) or incision and drainage can be taken. The left side of the chest pain caused by more diseases, need to be combined with the accompanying symptoms, duration, auxiliary examination, etc. Comprehensive judgment, should go to the hospital in a timely manner, diagnosis and treatment by a professional doctor, follow the doctor’s instructions to use medication, do not blindly self-medication.