Soft tissue injuries such as sprains and strains can cause swelling and tenderness

https://pr.walnutcreekmagazine.com/article/Atlantas-Hurt-911-Injury-Centers-Revolutionizes-Car-Accident-Recovery-with-Doctor-Led-Care-and-Legal-Support?storyId=6827816017bc4f0008d9ab83

Soft tissue injuries such as sprains and strains can cause swelling and tenderness, often taking weeks to heal despite seeming minor initially.