The team have already lost a two-match series against Sri Lanka this year, and will play a five-Test series against India over seven weeks starting on Wednesday.
The bowler told BBC Sport: "The schedules are a little bit crazy. In the next 42 days we've got 25 Test-match days, so it doesn't leave a lot of time to rest.
"You have to manage workloads. Will I play all five [matches]? If I do, we've bowled really well. I've got a bit of a sore knee at the moment. It's a tendonitis problem, it's a constant annoyance. It will get sorted when there's a window, but I can play cricket with it.
"You never want to miss a Test match, it's the worst phone call you can get from the selectors. But if you get into a 'red zone', you've got a high-percentage chance of getting injured. You're better off missing one Test match than missing 10."
Broad had played 67 Test matches for England since making his debut in 2007.