This time of year, I see my triathlon patients showing up in the clinic with overuse injuries.
Because it is early season and the weather is getting nicer, there is a tendency to ramp up training too fast. My suggestion is pretty simple really, instead of increasing miles in your run, say, try to double up sports, do a bike ride before your run. That way you increase your aerobic training, but reduce the pounding . As the season progresses, you can increase your mileage output in your run, bike or swim, but to avoid injury, try doubling up sports.
Remember, the best way to deal with a sports injury is to avoid one altogether!