Once a year, closed injections are usually not very harmful.
The main ingredient in closed injections is a glucocorticoid such as compound betamethasone or triamcinolone acetonide, which is used for pain relief, diagnostic treatment, softening of fibrous scar tissue and reduction of the local immune response to trauma.
Closed injections are indicated for chronic exertional disorders such as lumbar myofasciitis and achalasia, acute injurious disorders such as acute lumbar sprains and traumatic synovitis and other disorders such as lumbar disc herniation. The dosage of medication used in closed injections is usually small and the effect only lasts for a few weeks, so a shot once a year will not have a great impact on the body.
If you need to take medication, it is recommended to take medication under the guidance of a doctor, not blindly self-medication, in order to avoid adverse effects.