Wrist sprain is really common injury, it may cause by a lot of different reason, such as fall down, impact or pressure in abnormal angle or sudden force.
The ligament that located around the wrist.
Excessive stretch or abnormal pressure on the wrist ligaments that cause acute injury; it will repetitive strain injury because of overuse.
Any activities can cause wrist sprain, especially high impact sports, such as football, basketball. Etc Also, it's really common occurs when using hand as protection while falling.
Swelling on the wrist, and pain while moving the wrist.
Apply an ice pack on the injured area, elevate the upper arms. Also can apply some compression on the wrist to reduce the swollen.
Stop any activity, especially the activities will have weight load on an injured angle.