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 24
Call 999 (911 in the US)
For chest pain that comes on suddenly and doesn't go away, feels tight or like squeezing, or spreads to your arms, neck, jaw, stomach or back; a sudden, extremely painful headache, for example during a heavy lift (the NHS says a bleed on the brain may be more likely when lifting something heavy); someone who faints while exercising; palpitations that don't go away, or come with chest pain, breathlessness or feeling faint; or signs of a stroke, even if they've stopped. Don't drive yourself to A&E.
Sources 28, 29, 30, 31, 32, 33, 34
Check before you start
If you haven't exercised for some time or have a medical condition, speak to your GP first, as the NHS advises. Get advice before heavy lifting if your blood pressure is uncontrolled, or you have heart disease or chest pain when you're active, a pacemaker or defibrillator, diabetic eye disease, glaucoma, a hernia, recent eye or tummy surgery, or you're pregnant, as our breathing guide lists.
Source 35
A pop at the front of the elbow
Go to an urgent treatment centre or A&E for a pop or snap and sudden pain during an effort, which could be a torn tendon. At the front of the elbow, with bruising and a bulge in the upper arm, don't wait for it to settle: a torn biceps tendon is best repaired within the first 2 to 3 weeks. A sudden pop with pain at the shoulder or upper arm needs a GP or NHS 111 the same day.
Source 6
Elbow pain that doesn't settle
See a GP if elbow or arm pain hasn't gone after a few weeks of looking after it yourself; in many areas you can refer yourself to NHS physiotherapy. Go to an urgent treatment centre or A&E if your arm tingles or feels numb after an injury, and call 999 for arm pain that comes on suddenly with pressure, heaviness or squeezing across your chest.
Source 15
Your back
Call 999 or go to A&E for loss of feeling or numbness around your genitals or bottom, new trouble peeing or controlling your bladder or bowels, changes in genital sensation during sex or problems with erections or orgasm, or pain, tingling, weakness or numbness in both legs. These are signs of cauda equina syndrome, which needs treating in hospital urgently; don't drive yourself. Back pain with chest pain is also a 999 call.
Source 36
Your knee
Get advice from NHS 111 if your knee is very painful, you can't move it or put weight on it, it's badly swollen or has changed shape, or it locks, gives way or clicks painfully; painless clicking is normal. In the US, use urgent care.
Source 37
A new lump or bulge
See a GP if you think you have a hernia. Get help from NHS 111 if you have a hernia and pain in or around it, a bloated tummy, sickness, constipation, a high temperature or sudden confusion. Call 999 or go to A&E for a femoral hernia (a lump at the top of the thigh) with very bad tummy pain, sickness, being unable to fart or poo, a high temperature or sudden confusion.
Sources 38, 39