I posted this because there are very much questions asked on how to regain HHP. I hope this will get stickied, so everyone can see this.
1. Search for an swamp. An swamp looks like some green land with blue on it on the minimap. Then stay there, unwear your things and wait until leeches attach to your equip slots. Be sure that u don't have less SHP (the one that regenerates automatilicly), otherwise you will be knocked out by the leech. And be sure to eat food, don't let your hunger bar drop down too much. Every 3 SHP that the leeches takes off from you you get one HHP (hard hitpoints, the one that doesn't regenerate, and when it hits 0, you are permanent dead). This is a good way for newbie's, because the other way will be too hard for a newbie to achieve.
2.
1. Search for a four-leafed clovers. You can find these on grass, moor or heathland. Your per*exp (perception * exploration) has to be atleast 250, higher is recommended.
2. Search for a mouflon, you can find these also on grass, moor or heathland.
3. Feed the four-leafed clover to the mouflon. To do this, left click the four-leafed clover, and then right click the mouflon.
4. Wear something sharp, like a stone axe. Then right-click the mouflon you feeded the four-leafed clover to, and click sheer. Now you will get one piece of wool. If you want more, feed it more four-leafed clovers.
5. Build a loom, or walk to it if you have one. Right-click the loom to be sure you are positioned right to it.
6. Press on "Craft", then select "Gauze". Now it will make it a gauze.
7. If you are wearing something on your head, unwear it.
8. Left-click the gauze, and right click on the character you want to heal. Press "Treat", wait a bit, now you will have a gauze on your head. A gauze will heal 30% of your of your current HHP, very very slowly. If you notice it doesn't heal anymore, unwear it. It now changed in an useless bloody rag.
Note: For the 2nd way you need the skill first-aid, or someone with that skill who can threat you.