FAQ Questions worth asking © United Physiotherapy Clinic 2011 / disclaimer What are the side effects? You may experience temporary soreness and/or swelling for 24 to 48 hours, but rarely up to 2 to 4 days. There may be local tenderness. However many patients experience significant pain relief. Bruising is possible but not common. No serious complications or side-effects have been reported in large scale trials of SWT. After treatment you can return to daily activities almost immediately. But you may need to taper the activities in a self-limiting fashion. Regarding sports activity, you should seek advice from your physiotherapist about this.  Frequently Asked Questions 3: