Left forearm dull achy pain x2 weeks. try to massage it, tender muscles. no injury/trauma. not severe, no need for tylenol (acetaminophen) just annoying. bone cancer?

Inflammation: You may have tendonitis or epicondylitis such as tennis elbow which will cause pain in your forearm especially when lifting. You be seen by your doctor to find out what is actually going and get proper treatment.

Whoa!: Hold your horses! By all means, see your doc and get bloodwork --plain CBC will clear up your concern about bone cancer because your white blood cell count won't be normal if that's what it is. MORE LIKELY, tho, you are doing a repetitive activity you aren't noticing that's making your arm tired. As a mom. If you're R handed, do you hold baby L handed to do stuff? Is baby getting bigger? be well!