Lydia...
has some issues...and i'm talking about how she sits in your bedroom making funny noises

her stats don't rise as she levels (this may apply to some other followers also).
to find out if your follower is levelling correctly go into first person get Lydia (or another follower) clearly in view (this is perhaps best done in your home btw).
save or quick save just in case you completely bork something. its not at all likely but better safe than sorry.
now and pull up the console by pressing the ` key.
the game will pause and a black shaded area will rise from the bottom of the screen and present you will a command prompt.
now click on Lydia with the mouse pointer and a number will appear.
in Lydias case the number will be 000A2C94
this number is her "RefID": her Reference ID. it will always be an 8 digit hexadecimal number meaning it contains both numbers and letters.
with Lydia clicked and the number still showing in the middle of the screen type the following:
getavinfo health
press Return
what this command does is Get Actor Value Info about Lydias Health stat
pretty straight forward ye ?
ok what do you see ?
you should see something like this (using example numbers):
GetActorValueInfo: Health on Lydia
...Current Value : 200.00 Computed Base : 200.00
...Base Value Components:
......Reference Base value 300.00 (Auto Calculated)
...Modifiers : Temp : 0.00 Perm : 0.00 Damage : 0.00
the first line is pretty self explanatory: this is the command you entered.
the second line is pretty self explanatory too. this is her current health value and following that the Base to which any Modifiers will have been added. we'll come back to Modifiers later.
the third line is perhaps the most important for this topic because this number is the Auto Calculated number she should have for the level she is at. for most if not all of you that number will be higher than the other two but really all three numbers should be the same.
the forth line is Modifiers which can be added to the character through various means. this includes gear and if she is wearing any +health items you will see their effects listed here.
ok so you've done this and your Lydia doesn't have the right amount of Health. what can you do ?
its actually very simple to fix:
first close the console again by pressing `
second talk to Lydia and tell her you are breaking up

she will say she's going home and leave your service and you will get a message in the top left of the screen saying so.
press ` again and open the console.
click Lydia and make sure the number is present in the middle of the screen again. be careful not to touch your mouse during this time and move it off her.
type the following:
disable
press Return
she will disappear. don't panic.
type the following:
enable
press Return
she will reappear.

type the following again:
getavinfo health
press Return
you should see that all three Health numbers are now the same and all is right in the world.
close the console again by pressing ` and pick her up again as a follower.
she probably will have equipped her default gear but don't worry she still retains her inventory through the disable/enable commands all you have to do to get her to wear it all again is take something off her and give her it straight back. this will cause a refresh as she examines her inventory and she will equip all her gear once more.
doing this does not just affect Health but will raise all her stats to a new higher level if she has fell behind. i simply use Health as an easy indicator of the issue but i'll cover how you can view and what you can do with some of the other stats in the near future when i extend this post.
you can repeat this process at any time and she will readjust to any new level you have reached.
i hope those of you who have never tried anything like this before found this post useful and informative
