You gain Hitpoints xp every time you engage in Combat. Whenever you hit someone/something, or get hit, you gain a small amount of xp, rarely more than 1 or 2, one reason why Hitpoints is a very slow skill.
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To get your hitpoints level up in RuneScape, you must gain the appropriate amount of experience points that it says you need. That means you have to do a lot of combat related things, such as melee, magic, or range. Those skills will train your hitpoints when you use them.
Bread heals 5 hitpoints.
In order to gain Constitution Xp you must inflict damage on an NPC or in PvP and you will get 10% of the damage as constitution Xp.
It depends. It heals 15% of your total hitpoints, and it can go above your maximum hitpoints. It can heal up to 640 HP if you drink all four doses and have a hitpoints level of 99. :-)
The RuneScape monster TzTok-Jad's stats are: Combat Level: 702 Hitpoints: 250 Max Hit: 97