What causes pain in the chest and under the armpit?

Chest and underarm pain may be caused by intense exercise, poor posture, emotional factors, mammary gland hyperplasia, pleurisy, etc., and can be improved according to different situations. It is recommended to seek timely medical attention at a hospital and receive treatment under the guidance of a doctor.

1. Intense exercise: Engaging in vigorous upper-body or chest exercises—such as push-ups, pull-ups, or prolonged chest-expanding movements—may lead to muscle strain or lactic acid buildup in the chest and underarm areas, causing pain. Immediately stop intense physical activity and allow the body sufficient rest. Apply heat therapy to the painful area for 15–20 minutes, 3–4 times daily, to promote blood circulation and relieve muscle fatigue and discomfort.

2. Poor posture: Maintaining incorrect posture over long periods—such as slouching, working at a desk for extended hours, or sleeping while compressing one side of the chest—can keep chest and underarm muscles in a tense state, leading to pain. Maintain proper posture, avoid prolonged bending or desk work, and take breaks regularly to stand up, move around, and stretch your body. Choose appropriate pillows and mattresses when sleeping, maintain good sleeping posture, and avoid putting pressure on the chest.

3. Emotional factors: When experiencing negative emotions such as anxiety, tension, or depression, the body may exhibit stress responses that cause muscle tension in the chest and underarm regions, resulting in pain. Learn to regulate emotions by using deep breathing, meditation, listening to music, or talking with friends to reduce stress and negative feelings, thereby relaxing both mind and body.

4. Mammary gland hyperplasia: Commonly seen in women, this condition is associated with endocrine disorders. Fluctuations in estrogen levels before and after the menstrual cycle can cause breast tissue proliferation, possibly leading to radiating pain in the chest and underarm areas. Under a doctor's supervision, patients may use medications such as Xiaoyao Pills, Rubeixiao Tablets, or Xiaojin Pills to alleviate symptoms.

5. Pleurisy: Pleurisy is an inflammation within the pleural cavity, often caused by viral or bacterial infections. Inflammation stimulating the pleura can result in chest and underarm pain, which typically worsens with breathing or coughing. It is recommended to take medications such as aspirin tablets, ibuprofen sustained-release capsules, or cefixime dispersible tablets under medical guidance to relieve discomfort.

In daily life, it is advisable to avoid excessive fatigue and strenuous exercise to prevent physical discomfort. Maintain a light diet and avoid spicy or irritating foods such as garlic, hot pot, wasabi, etc. Ensure adequate rest and avoid overexertion to protect overall health.