Stop and get medical help
If you get chest pain or pressure, feel faint or dizzy, are unusually breathless, or your heart races or beats irregularly during exercise, as our plans advise. The American Heart Association says these need immediate medical evaluation.
Source 31
Call 999 (911 in the US) or go to A&E
For sudden chest pain that doesn't go away, spreads to your arms, neck, jaw, stomach or back, or comes with sweating, feeling sick, light-headedness or breathlessness. For palpitations that don't stop, or come with chest pain, breathlessness or feeling faint. If someone faints while exercising. For a headache that started suddenly and is extremely painful, for example while straining under a heavy lift. For back pain with pain, tingling, weakness or numbness in both legs, loss of feeling around your genitals or bottom, or changes in your bladder, bowels or sexual function: don't drive yourself. For arm pain that comes on suddenly with pressure, heaviness or squeezing across your chest. If glaucoma symptoms come on suddenly, such as intense eye pain, a red eye or blurred vision.
Sources 36, 37, 38, 40, 41, 42, 43, 47
Urgent treatment centre or A&E: your arm
If you injure your arm and hear a snap, or it changes shape, tingles or feels numb. A pop or snap with sudden pain during a lift, then bruising at the front of the elbow and a bulge in the upper arm, could be a torn biceps tendon: don't wait for it to settle, as it's best repaired within the first 2 to 3 weeks.
Source 43
Same day: the front of your knee
A pop or tearing feeling at the front of the knee after a fall, stumble, jump or landing, then you can't straighten the knee or lift the straight leg off the bed, there's a dent above or below the kneecap, or the kneecap sits higher or lower than on the other side. Go to A&E or an urgent treatment centre, or get help from NHS 111.
Get help from NHS 111 now
In the US, contact your doctor or urgent care. For wrist pain that's severe, or a snap, grinding or popping when it happened, a wrist you can't move or hold things with, or lost feeling in your hand. For sudden or very bad shoulder pain, an arm you can't move, or pins and needles that don't go away. For a knee that's very painful, can't take your weight, is badly swollen, or locks or gives way. For an arm that hurts when you exercise but eases when you rest. For a headache brought on or made worse by exercise. For a painful hernia, or one with feeling sick.
Sources 44, 45, 46, 43, 40, 48
Light-headed after a heavy lift
Stop, sit or lie down until it passes, and get up slowly. If it keeps happening, see your GP.
Sources 39, 29
Stop the set
If a joint pain is sharp, builds during a set or lingers into the next day, swap to an easier option, such as push presses instead of jerks, and see a clinician if it persists.