What causes discomfort under the left rib?

Generally, discomfort under the left rib cage may be caused by conditions such as left-sided pneumothorax, left intercostal neuralgia, or gastritis. Specific analysis is as follows:

1. Left-Sided Pneumothorax

Left-sided pneumothorax typically refers to the presence of gas in the patient's left pleural cavity, resulting in an accumulation of air. This condition is often caused by factors such as tumors or trauma. Patients may experience symptoms like chest tightness and coughing. The irritation from the accumulated air can lead to the aforementioned discomfort. Patients should visit a qualified medical facility and, under a doctor’s guidance, undergo procedures such as air evacuation to treat the condition.

2. Left Intercostal Neuralgia

This condition usually occurs due to damage from various factors, causing pain in one or more areas innervated by the intercostal nerves on the left side. The pain may be persistent or intermittent, leading to the symptoms described above. Under medical supervision, patients may take medications such as carbamazepine tablets or pregabalin capsules for treatment.

3. Gastritis

When a patient develops gastritis, inflammatory irritation can cause symptoms including loss of appetite, abdominal bloating, and pain. Treatment should follow a physician's instructions using medications such as复合 digestive enzyme capsules, bismuth potassium citrate tablets, or colloidal pectin bismuth capsules.

In addition to the above, similar symptoms could also be caused by gastric ulcers, duodenal ulcers, stomach cancer, or other conditions. It is recommended that patients seek evaluation at a qualified hospital, undergo appropriate examinations under medical guidance, identify the underlying cause, and receive targeted treatment promptly to avoid delays in care. During treatment, adequate rest is essential, and strenuous physical activity should be avoided.