From the many dangeorus things that await in the woods anda re dangerous are:
Infection — it’s easy for a blister or small cut to get nasty on you. Make sure you take a first aid kit.
Injuries — it’s super easy to break an ankle, cut your hand with a pocket knife, fall and hit your head, and so forth.
Food poisoning — it’s easy to decide that the cheese is probably still good, and then regret it later. Or you can’t finish all your dinner and decide it’s cool enough that it will keep until breakfast, but it doesn’t.
Bad water — you might remember not to drink the water, but what if you jump in for a swim and get some in your mouth? Or if you purified the water, did you remember to purify the bottle cap, too? That apple you just rinsed off in the creek … it’s now wet with bacteria laden creek water. And so forth. It’s easy to get careless, or forgetful, and get sick. Been there and done that.
Poison ivy and other nasties. Know what they look like. Pack benadryl anyway. (And know what members of the carrot family look like and avoid them on general principles. Assume they’re all bad news. They probably are.)
The weather. Depending on location, this may need to be at the top of the list. Figure out what the climate hazards are, then double whatever protection you think you need. Is it going to be hot? Bring extra water. Bring more water than you think you’ll ever need. And drink it. (And read up on water intoxication while you’re at it. Bring gatorade powder.) If it’s going to be cold, bring layers, an extra warm coat, gloves, hat, wool socks, good boots, and then a couple extra layers. And regardless of what the forecast is, assume it’s going to rain the entire trip, and bring good quality rain gear. (Remember, if you’re out in the woods, you cannot just go inside to dry off and warm up — you have to stay dry, and warm, to start with. Keep ahead of the curve and do not let yourself get chilled or you will be in real trouble.)
animals. bears