Painful arm extension and grip is one of the symptoms of bursitis, a painful inflammation that occurs in the bursa. A normal bursa contains synovial fluid, which facilitates normal movement of joints and muscles and reduces friction. Bursitis can cause pain and limited movement of the limbs. However, the specific symptoms depend on the site of the inflamed bursa. The dietary principles of bursitis leading to painful arm extension and grip: 1. It is advisable to eat foods that invigorate blood circulation, aromatic and open the orifice, such as panax ginseng, hawthorn, patchouli, allium, capers, etc. 2, eat more fresh vegetables, fruits, beans. 3, late in the course of the disease, it is advisable to eat food containing nutrients such as grapes, black beans, wolfberry, cinnamon, turtle meat, etc. to nourish the qi and blood, nourish the liver and kidney. 4, avoid such as fried, barbecued, too salty, too sweet food. 5, avoid eating spicy, fishy and other thick flavors and tobacco and alcohol stimulating products.