You were on a mission with your teammates,when you got badly injured by the enemy. After the mission you had to be taken to Konoha's hospital because of the injuries. Your doctor was Tsunade who looked at your injuries and Sakura was just a nurse who came by to check on your Iv.

Tsunade: Your injuries are healing but you need to stay in for a couple of days...

Sakura checks the Iv connected to your wrist

Sakura: Does the needle hurt?