KraneXL

Along with heat the second biggest one with me. Fortunately, my new sun glasses completely cured this one. Are you overweight? Possible high blood pressure (which increases with activity naturally) is sometimes a reason for this one. Get it check out just in case.

Dave Cutter

You DID launder that skull cap before wearing it..... right?
I am pretty hairless under my helmet now-a-days. So I always were a do-rag. In extreme heat I only wear my thin cotton ones, as the thicker tech fabric ones build-up too much heat.

Headaches are common and generally considered harmless plus, ouchies are normal with sports. Most likely your dehydrating. But it would be prudent to mention the headaches and your training routine to some sort of exercise or healthcare professional.

Anohaakten

I have absolutely had this happen. It is the reason I went from a drop bar road bike to the flat bar road bike I currently have. Hopefully you are able to resolve the issues you have!

McBTC

No problem on a subsequent ride but I did change sunglasses... different skull cap, only one IPA, not as hot, rode a bit slower, still ate a tin of kippers, drank a lot of water before and after, switched from Goldfish to Cheez-Its ('gotta go back to goldfish).

MoAlpha

I have an old specialty board certification that implies I once knew something about headaches and I'm here to tell you that tight sunglasses will do it.

dfischer

I'm a frequent migraine sufferer, so I don't take your pain in jest. However, this post reminded me of this old joke:
-------------------

Joe had suffered from really bad headaches for the last 20 years. He eventually decides to go and see a Doctor.

The Doctor said, 'Joe, the good news is I can cure your headaches. The bad news is that it will require castration. You have a very rare condition which causes your testicles to press on your spine and the pressure creates one hell of a headache. The only way to relieve the pressure is to remove the testicles.'

Joe was shocked and depressed. He wondered if he had anything to live for. Yet he had no choice but to go under the knife. The surgery cost him $15,000.

When he left the hospital, he was without a headache for the first time in 20 years, but he felt like he was missing an important part of himself. As he walked down the street, he realized that he felt like a different person. He could make a new beginning and live a new life. He saw a men's clothing store and thought, 'That's what I need... A new suit.'

He entered the shop and told the salesman, 'I'd like a new Suit.'

The elderly Tailor eyed him briefly and said, 'Let's see... size 44 long.

Joe laughed, 'That's right, how did you know?'

'Been in the business 60 years!' the tailor said.

Joe tried on the suit it fit perfectly.

As Joe admired himself in the mirror, the salesman asked, 'How about a new shirt?'

Joe thought for a moment and then said, 'Sure.'

The salesman eyed Joe and said, 'Let's see, 34 sleeves and 16-1/2 neck.'

Joe was surprised, 'That's right, how did you know?'

'Been in the business 60 years.'

Joe tried the shirt and it fit perfectly. He walked comfortably around the shop and the salesman asked, 'How about some new Underwear?'

Joe thought for a moment and said, 'Sure..'

The salesman said, 'Let's see..... size 36.

Joe laughed, 'Ah ha! I got you! I've worn a size 34 since I was 18 years old..'

The salesman shook his head, 'You can't wear a size 34. A size 34 would press your testicles up against the base of your spine and give you one hell of a Headache.'