Heel pain on a rainy day can be caused by rheumatoid arthritis, osteoarthritis or gouty arthritis. 1. Rheumatoid arthritis: It is caused by a combination of genetic, infectious and environmental factors, and patients usually experience morning stiffness, pain and dysfunction of the joints. The cold air on rainy days can easily stimulate the local joints, which will lead to the symptoms of heel pain on rainy days. 2. Osteoarthritis: Osteoarthritis is a kind of chronic joint disease whose etiology is still not clear, when overworked or cold, it will lead to joint soreness and pain, so the patients will have the symptom of heel pain on rainy days. 3. Gouty arthritis: is due to urate microcrystals deposited in the joints and induced joint inflammation, when the patient is in the cold, moisture and other environments can easily lead to an attack of the disease, so the patient will appear rainy day heel pain. Patients who experience heel pain on rainy days should seek medical examination and treatment under the guidance of a doctor to avoid delaying the condition to the body.