Please choose the correct ending to complete the given sentence: Health: [header] How to diagnose a frozen shoulder [title] Check for stiffness and pain in the shoulder. [step] The first stage of frozen shoulder is the " freezing " phase. In this phase, you will experience stiffness and pain in your shoulder that builds up over time, usually 2-9 months.

Ending1: The onset of pain is slow and gradual and localizes near the deltoid insertion. Most people describe it as achy, but it can become sharp when the affected shoulder reaches its extreme range of motion. Ending2: The stiffness is caused by the muscle fibers releasing the fluid from the spine tissues to aid in the freezing process. [substeps] Stiffness is usually treatable with surgery. Ending3: [substeps] In the frozen shoulder stages, stiffness and tightness are more apparent and they are perceived as a strong sign that the muscles are broken. There may also be an increased weight bearing on your shoulder, which might suggest that the muscle is damaged. Ending4: Some cramping in your shoulder may take place in the 9 months before the freezing occurs. [title] Pay attention to your level of movement.

Answer format: ending1/ending2/ending3/ending4