Arm pain when injecting azithromycin is usually caused by macrolides, the permeability to the vessel wall and adsorption to the vessel wall, resulting in vascular pain and tingling and arm pain. The following four ways can be applied to relieve: 1, need to immediately slow down the drip rate of azithromycin injection, can be adjusted to 7-10 drops / minute can be, observe the situation, to see whether the arm tingling is alleviated. 2, such as hanging azithromycin after the arm continues to ache, can be applied to the local external application method, you can choose to use magnesium sulfate injection diluted with an external application, but also to relieve the vascular hyper-permeability. 3, can be applied to the physical therapy of the Physical therapy can be applied to relieve the pain, such as local warm towels for hot compresses, rubbing and local muscle massage, can also relieve arm pain. 4, such as the above methods are not relieved, you can go to the regular physical therapy department line ultrashort wave or microwave and other physical therapy to relieve arm pain.