For how we live.
An overactive thyroid speeds the body up; an underactive one slows it down. But no single symptom is reliable — in one large screening study, individual thyroid symptoms were poor at flagging who actually had a problem.
A limb that has "gone to sleep" is brief pressure on a nerve and clears in minutes. Tingling that is persistent or spreading can mean carpal tunnel, diabetes or low B12; sudden one-sided numbness is an emergency.
In midlife women the usual cause is the menopause transition, where hot flushes and night sweats last a median of seven years. In older adults they are common, mostly benign, and rarely a mortality signal.
When adults see a doctor for new fatigue, fewer than one in ten turn out to have clear physical disease. The common, treatable and often-missed exception is iron deficiency, which drains energy before it causes anaemia.
Nail changes can hint at systemic disease — clubbing, spoon-shaped nails, splinter haemorrhages. But the everyday worries, like lengthwise ridges and little white marks, are usually harmless.
Floaters are usually ageing changes in the eye's gel. But among people who suddenly develop floaters and flashes, about 14% turn out to have a retinal tear — which can lead to permanent vision loss if left.
When fingers and toes turn white then blue in the cold, it is often Raynaud's phenomenon. A Cochrane review finds the standard drugs — calcium channel blockers — cut attacks only modestly.
Topical antibiotics beat placebo in pooled trials, but UK guidance now recommends hydrogen peroxide cream first for mild cases — a deliberate move to spare antibiotics.
Up to a third of children get the label, but a review of 145 studies shows doctors do not agree what growing pains are — not even that they involve the legs. Here is what the evidence supports, and the warning signs.
The occasional held bladder is not going to burst or poison you. The real concern is habit: routinely ignoring the urge, or being unable to empty at all, which is a medical emergency.
Insecticide shampoos increasingly meet resistant lice. Trials favour physical treatments — a silicone lotion and methodical wet combing — that lice cannot evolve around.
The system sorts feverish under-5s into red, amber and green. Validation studies find it misses serious illness and over-refers the well — a prompt, not a reliable test.
Mostly how concentrated it is: pale means well-hydrated, dark means less so. But a few colours — especially red or pink — are signals to get checked rather than to interpret at home.
US preventive guidelines back a blood-sugar test for adults 35 to 70 who carry extra weight; the main diabetes body would test every adult from 35. The gap is about how wide a net catches enough real disease.
A Cochrane review of 24 trials found surgery beats non-surgical care at stopping an ingrown toenail coming back; adding phenol to the operation cut recurrence from 41% to 14% in the one head-to-head study.
The evidence-based first move for a burn is unglamorous: hold it under cool running water. A large registry study links proper cooling to fewer skin grafts and ICU admissions; ice and butter belong nowhere near it.
Artificial tears are still the mainstay, but the trial evidence cannot say which brand is best. A 3,000 mg fish-oil study in 535 people found no benefit over an olive-oil placebo.
Waking up drenched is common and, the best review found, usually nonspecific — not a sign of shortened life. In women the leading identifiable driver is the menopause, which can last far longer than most expect.
Most bad breath starts in the mouth. Cochrane reviews found tongue scraping cuts odour compounds only briefly, and the rinses that work best also stain the teeth.
TRICORDER put an AI-enabled stethoscope into UK primary care. Over a year it did not increase heart-failure diagnoses population-wide, even though the device, when actually used, flagged more disease.
When brief vertigo is triggered by rolling over or looking up, it is usually a loose crystal in the inner ear. A Cochrane review found a repositioning manoeuvre resolved it in 56% versus 21%.
Swollen ankles are common with age. Chronic venous disease rises steeply over the years, and a very ordinary culprit is medication: calcium channel blockers caused ankle swelling in 10.7% of users versus 3.2% on placebo.
Digital adherence gadgets promise to fix forgotten doses. In a 53,480-person randomised trial, low-cost reminder devices did not raise adherence at all. Text reminders did more, but on short, self-reported trials.
A child with a suspected concussion should be removed from play and not return the same day. But prolonged strict rest is no longer advised, and light activity within days can speed recovery.
Guidelines now ask for an objective test before an asthma label is fixed to a child, and inhaled steroids remain the mainstay of control. Their benefit is real; so is a small, mostly temporary effect on growth.
One in five people get chronic itch at some point. When no rash and no cause turn up, a Cochrane review found almost no trials at all — leaving guideline experts to work from indirect evidence.
Enuresis alarms have the best evidence for a lasting cure, working in about two-thirds of children who use them. Desmopressin acts faster but the wetting tends to return when it stops.
Three randomised trials found routine finger-prick testing produced no clinically meaningful change in long-term blood sugar for people whose type 2 diabetes is managed without insulin.
A Cochrane review of 79 trials and 24,308 patients found the primary-care model helps with depression and anxiety, modestly in the short and medium term and not at all in the very long term.
Most acute ear infections settle on their own, and antibiotics barely change symptoms in the first day. Their benefit is real but modest, which is why guidelines allow a short period of watchful waiting.
A $7.9 billion program now pays practices an additional 12.5% on top of the standard Medicare rebate for every bulk-billed visit — split evenly between the clinic and the doctor who sees the patient.
A comparative survey finds four European countries still rely on opportunistic screening, and that where family doctors are most involved, participation tends to be lower — not higher.
A blinded comparison of 180 responses from a university telehealth centre in Minas Gerais found AI matched human specialists on medical adequacy and risk, and beat them on comprehensibility.
Six randomised trials found no benefit from immediate imaging over usual care. A separate review explains the reason: most of what a scan finds is present in people with no pain at all.
Maccabi Healthcare Services studied 626 of its own physicians to work out who follows algorithmic prescribing advice — and found the pattern was about practice structure, not just attitude.
Guidelines say earwax that causes no symptoms should be left untreated. When wax truly blocks the ear, drops, irrigation or clinician removal help, but ear candles, when tested, removed no wax and caused injuries.
The nosebleed guideline first move is specific: firm, sustained pressure on the soft lower third of the nose for at least five minutes. Most settle this way; the treatments people escalate to have thin evidence.
Most hiccups stop on their own, and the remedies everyone swears by have almost no trial evidence. The one gadget with published data was studied by its own inventor and funded through the product crowdfunding campaign.
Fourteen Swedish primary care patients were interviewed alongside a trial of nurse-led group sleep restriction therapy. Depression and life circumstances were what got in the way.
Across 90,670 virtual encounters at one US health system, phone visits scored lower on likelihood to recommend. A separate VA cohort of 1.2 million found telehealth cut same-day mental health access sharply.