Concussion

"You have suffered a concussion and all attributes are lowered by 1. Use painkillers to cure this."

Description
Concussion is a negative status effect. Whenever the player gets stunned from an attack, there is a 50% chance for the player to become concussed. This also means that it can be temporarily prevented with things that provide stun resist, such as Beer. However, stun resist will not retroactively cure concussions that have already been afflicted.

A concussion will last 2 hours and lower max health by 25, which will slowly go down as the injury heals. Furthermore, a concussion will lower every skill (Perception, Intellect, etc.) by 1. This means that if a player has a perk that requires lvl 5 Strength and the concussion lowers the player's Strength to 4, they will lose the effects of that perk for the duration of the concussion. This level reduction cannot reduce a skill below 1/10, wherein it will simply have no effect. Additionally, the player will periodically suffer blurred vision and hearing that lasts for 5 seconds where the player's run speed, walk speed, crouch speed, and jump height will be reduced by 80%.

Taking Painkillers immediately and completely removes the debuff.