Chiropractors use a variety of techniques to treat midback pain, rib pain, and thoracic outlet syndrome. These techniques may include:

1. Spinal adjustments: Chiropractors use gentle manipulation to realign the spine and reduce pressure on the affected area. This can help to alleviate pain and improve mobility.

2. Soft tissue therapy: Chiropractors may use techniques such as massage and muscle energy techniques to reduce muscle tension and inflammation in the affected area.

3. Stretching and exercises: Chiropractors may recommend specific exercises and stretches to help improve flexibility and strength in the affected area.

4. Postural and ergonomic correction: Chiropractors may also provide advice on posture and ergonomics to help prevent further injury and promote healing.

5. In cases of thoracic outlet syndrome, chiropractors may use techniques such as manipulation of the first rib, or mobilization of the scalene muscles to reduce the compression on the neurovascular bundle.

It's important to note that treatment plans may vary depending on the individual's specific condition and needs. And the treatment may take some weeks or months to see the improvement.