When you gain Constitution by leveling up and your mod increases do you gain past levels in health?

For example,

A gunslinger has 13 con which makes a +1 mod. If they roll 4 each level at level 4 they would have 20 health. They put their gained point into con increasing the mod to +2.

Would that effect only future levels or would you increase your health to 24?

Would it effect your current level making your health 21?


1 Answer 1


If a character's Constitution score changes enough to alter his or her Constitution modifier, the character's hit points also increase or decrease accordingly.

Any changes to your Con affect all relevant HD. This rule can be found in both Pathfinder and D&D 3.5.

  • \$\begingroup\$ No problem, just happened to be looking at the right time \$\endgroup\$
    – CatLord
    Commented Jan 6, 2014 at 20:24
  • 1
    \$\begingroup\$ CatLord: Updated it to cover both PF and 3.5, since the rule is the same. \$\endgroup\$
    – KRyan
    Commented Jan 6, 2014 at 21:34
  • 1
    \$\begingroup\$ The same is true for any change in Constitution score (ability drain/damage, spell effect, poison, rage ability, et al). \$\endgroup\$
    – Wyrmwood
    Commented Jan 6, 2014 at 21:59
  • \$\begingroup\$ @wyrmwood Mostly true but worth mentioning that in PF ability drain/damage works differently - you get -1 per 2 points regardless of what your stat is (odd or even) - e.g. 14 CON and 1 point of CON damage = no effect yet. \$\endgroup\$
    – mxyzplk
    Commented Jan 7, 2014 at 15:14
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    \$\begingroup\$ Weird. Why penalize someone further for an otherwise useless odd point? \$\endgroup\$
    – Wyrmwood
    Commented Jan 7, 2014 at 18:58

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