A stabbing pain in the armpit may be caused by certain diseases, such as neuritis, breast hyperplasia, enlarged lymph nodes, herpes zoster, etc., which need to be treated according to the cause of the disease. 1. Neuritis: poisoning, infection, nutritional and metabolic disorders can cause neuritis, the onset of the initial patients will appear in the armpit burning paroxysmal tingling sensation, with the passage of time, the aggravation of the condition, the tingling sensation will be significantly strengthened. 2. Breast hyperplasia: If women have tingling sensation in the armpits, which changes with menstrual cycle, most of them are caused by breast hyperplasia. 3. Enlarged lymph nodes: Damaged skin in the armpits or sweat stimulation can easily lead to mastitis, breast cysts and other diseases, which can cause swollen lymph nodes in the armpits. 4. Herpes zoster: Infection with varicella zoster virus in the armpits will cause a stabbing pain in the armpits and localized blisters. The phenomenon of a burst of pain in the armpit is also seen in other causes, it is recommended to go to the hospital in time to do the relevant examination, for the cause of treatment, do not delay the condition, causing harm to themselves.