It may be due to muscle strain which is causing pain. If there is radiating pain along with numbness and tingling sensation there might be nerve impingement. Get checked with orthopaedic doctor or physiotherapist to find out the medical diagnosis.
Next Steps
Your physiotherapist will work on to reduce your pain and spasm if present and design appropriate set of exercises to prevent relapse. For long term management maintenance of correct and active posture is required. Your physiotherapist will guide you for this.
Health Tips
Avoid lifting and overhead reaching activities.