Originally Posted by Palomine
Could have deep seated abscess in muscle tissue too.
Or something wrong with the saddle internally.
Or you have saddle too far forwards.
Doesn't have to be a muscle abcess... could even just be muscle soreness.
If his pectoral muscles are sore it could be because he has hurt himself playing in the paddock, he could have slipped over, it could be caused by an increased work load, or poorly fitting equipment in the past. :)
My gelding is a nightmare when his pecs are sore. He bucks, bites and is generally a grumpy little sod. His is caused by problems in his sacro-illiac area and the referred pain patterns stemming from that. It is quite easily managed with body work as needed. :)
If not, than I agree it could be ulcers.
Hopefully you find a cause soon and can start working with your horse to get him comfortable. Let us know how you go :)