Thank you for your question , if you have one of those symptoms : Stiffness, pain, aching and tenderness of the large muscles around the shoulders and upper arms. The muscles around the neck and hips may also be affected. The stiffness may be so bad that you may have difficulty turning over in bed, rising from a bed or a chair, or raising your arms above shoulder height (for example, to comb your hair). The stiffness is usually worst first thing in the morning. Getting out of bed may be difficult. The stiffness often eases after an hour or so after getting up from bed and as the day goes on. Inflammation and swelling sometimes occur in other soft tissues of the body. For example, tendons may become inflamed (tenosynovitis), your hands or feet may become slightly swollen and some joints may become slightly swollen. Other general symptoms may also occasionally occur. These include tiredness, depression, night sweats, high temperature (fever), loss of appetite, and weight loss. All of those symptoms are similar in many diseases ((Polymyalgia Rheumatica , frozen shoulder, arthritis, etc ))) , First of all you have to preform (((( BLOOD TEST ))) erythrocyte sedimentation rate (ESR) Test and C-reactive protein (CRP) test. so we can define which one you have . Some tips you may use until you preform your test : Rest Avoid using your muscle for a few days, especially if movement causes an increase in pain. Too much rest can cause muscles to become weak, which can prolong the healing process. After two days, slowly begin using the affected muscle group, taking care not to overdo it. Ice Apply ice immediately after injuring your muscle. This will minimize swelling. Don’t put ice directly on your skin. Use an ice pack or wrap ice in a towel. Keep the ice on your muscle for about 20 minutes. Repeat every hour on the first day. For the next several days, apply ice every four hours. Compression To reduce swelling, wrap the affected area with an elastic bandage until swelling comes down. Be careful not to wrap the area too tightly, as this can reduce your blood circulation. Elevation Whenever possible, keep the injured muscle raised above the level of your heart. Other self-care methods include the following: Use an over-the-counter anti-inflammatory medication, such as ibuprofen (Advil). This will help keep pain and swelling down. Acetaminophen (Tylenol) can help with pain. After three days, apply heat to the muscle several times a day. This will help bring blood circulation to the area for healing. Don’t rest your muscle for too long. This can cause stiffness and weakness. Begin light stretching as soon as possible. Slowly increase your level of activity. When you return to normal activity, make sure to stretch and warm up before exercising. This will help increase blood flow to your muscles and decrease you risk of injury. You should make an effort to stay in shape. You’re less likely to suffer a strain if your muscles are strong and healthy. If your muscle strain is severe, you may need medical attention. Physical therapy may also be recommended.