Frozen shoulder typically develops slowly, and in three stages. Each of these stages can last a number of months.
- Painful stage. During this stage, pain occurs with any movement of your shoulder, and your shoulder's range of motion starts to become limited.
- Frozen stage. Pain may begin to diminish during this stage. However, your shoulder becomes stiffer, and your range of motion decreases notably.
- Thawing stage. During the thawing stage, the range of motion in your shoulder begins to improve.
For some people, the pain worsens at night, sometimes disrupting normal sleep patterns.