What's the best way to get rid of a headache?

Water, and sleep it off.
In my experience.

It pays to drink a glass of water before bed after an evening of alcohol.
- Eat a steak before going to bed too, in that case. Meat works wonders for hangovers.
- You sure? My wallet has always gotten smaller the next morning after drinking alcohol, whether or not I drank water before bed.
  /s

To add to this: if you take ibuprofen regularly, remember to eat before taking it. Taking it on an empty stomach a handful of times is completely fine, but if you do it too much can cause stomach ulcers (not insanely common as far as I'm aware though.).
Anyway, this person is right, take some ibuprofen and rest.
Naproxen is what works for me.
My headaches are mostly tension from hamstrings on up the back.
A sinus rinse and Sudafed helps when it's sinus congestion.

A Guillotine.

Paracetamol. Make sure you are well hydrated and a bit fed as well.

Ibuprofen and caffeine. After consuming, lay down and try to nap until the caffeine hits.

What kind of headache is it?

What do you mean?
- Like a migraine, sinus, pressure, or tension. Did anything seem to cause it? Does anything make it worse?

Lots of water, a quality meal and fresh air.

I typically go for a hike.

If you regularly consume caffeine and haven't recently: caffeine.

If you regularly consume nicotine but haven't recently: nicotine.

If you regularly consume any drug, really, but haven't recently: youre probably experiencing withdrawal; the most common side effects from withdrawal of most substances is a headache.

As other's have said, hydration. But that's only if you're dehydrated. There is a pressure point near the base of your thumb, a bit towards your pointer finger. You can look it up for more specifics. I find that hitting that pressure point helps about 20% of my headaches.

Caffeine, ibuprofen and a long walk combo helps me sometimes. I'm pissed they no longer sell ibuprofen with codeine here, that shit used to help me real fast.

Agree with the others here.

For future prevention, if you have money and since it's a tension headache - you might consider some corrective massage.

Sleep

< **deleted.** pls find info on fb/yt > ..
find the cause (inflamation, etc)

Sometimes, I've found that headaches can be caused by muscle tension or aches. I grind my teeth at night, for example, and if I forget to wear my mouthguard, I have headaches the next day. Often the tension is hard to spot until it's gone - I speculate that this is part of why sleeping tends to help with headaches.

If this is the cause, I've found that a strategy to identify and relax areas of tension is to work through an area and consciously tense the muscles, and then relax. It feels like turning something off and on again. Like if I've been doing computer work, my muscles around my eyes may be tired, and tensing the area for a few seconds and then releasing can help reduce that.