I thought about posting this in the Injuries/Rehab forum, but this is a pretty general (and anecdotal) question about putting on mass, so I thought I'd just post it here:
I've been lifting after a layoff and put on about 30lbs in the past 8 weeks (~155 to ~185, some of which may be fat, but no increase in waist size). I also run 5 miles a day (I've run up to 100mpw at times, as I used to train for long distance events, so 5 miles a day for me is very little).
This week, I've developed a pretty bizarre swelling in my right foot around the achilles tendon. I haven't been able to run for three days.
Thing is, I've had an injury similar to this one in the past that wasn't easy to explain. Last year, I went from 140 (very underweight from distance running) to 175 in short order. After a week or so at this weight, my left shin swelled significantly. I thought I had somehow broken my shin, so I got it seen by a doctor and X-rayed, and there was no break. He said he thought it might be compartment syndrome, but I should give it two weeks or so to see what it does since compartment syndrome is a pretty serious diagnosis. The swelling subsided after about two weeks, and the doctor never really gave a satisfactory explanation.
My own take on it now that I've had this sort of phenomenon recurred is that perhaps my body developed some sort of abnormality/slight injury (e.g. a slight stress fracture in the shin, or a slightly stressed achilles tendon), and the body supercomensated for the abnormality because of the drastic increase in load (bodyweight) over the short period of time. Does that seem reasonable?
Have any of you had any other weird reactions to putting on mass?