symptom.md Blog

Not every symptom needs a doctor visit, but some are red flags that require prompt evaluation. Learn which warning signs shouldn't wait.

symptom.md explains different types of chest pain — which need emergency care and which are likely muscular, digestive, or anxiety-related.

symptom.md helps you identify your headache type and know when a headache needs urgent medical attention.

symptom.md reviews the most common medical causes of unexplained fatigue — from thyroid problems to sleep apnea to iron deficiency.

symptom.md maps common causes of abdominal pain by location — upper, lower, right side, left side — to help you communicate with your doctor.

symptom.md explains what causes numbness and tingling — from carpal tunnel to vitamin deficiency to stroke warning.

Night sweats affect 10% to 41% of primary care patients and most cases are not serious. Here are the common causes, the red flags that change the picture, and the first-line tests.

A blood pressure drop of 20 systolic or 10 diastolic within three minutes of standing defines orthostatic hypotension. Here is how to measure it at home, what causes it, and how to tell it apart from POTS.

Most unexplained bruising is sun-thinned skin, a blood-thinning drug or supplement, or a forgotten bump; here are the platelet thresholds, the red flags, and the four tests doctors order first.

Losing 5% of your body weight in 6 to 12 months without trying is the threshold doctors use. Cancer explains 19% to 36% of cases; here are the other causes, the red flags, and the baseline tests that find the answer 72% of the time.

Only 1.1% of unexplained swollen lymph nodes in primary care are cancer. Here are the size thresholds by location, the red flags such as a node above the collarbone, and what the four-week rule means.

A cough past 8 weeks is chronic. Usual causes: postnasal drip, asthma, acid reflux, an ACE inhibitor, smoking, or post-infection cough. Red flags: blood, weight loss, fever.

Always cold? Hypothyroidism affects nearly 5 in 100 Americans and iron-deficiency anemia causes cold hands and feet. See 10 causes, the 4 tests to ask for, and red flags.

Itching with no rash is usually dry skin, but itch lasting 6+ weeks can signal liver, kidney, thyroid, iron, blood, or nerve problems. Causes, tests, red flags.

A pulse oximeter only shows oxygen saturation, not effort. Asthma, anemia, heart problems, low fitness, and anxiety can cause breathlessness at 95% to 100%.

A metallic taste (dysgeusia) often comes from medicines like metformin, colds, dental issues, or pregnancy. About 3 in 100 metformin users notice it at first.

Waking with a pounding heart is usually an adrenaline surge. Sleep apnea, nocturnal panic, evening alcohol and low blood sugar are the most common causes.

Muscle aches without exercise usually mean a virus, a medicine, or stress. Thyroid, vitamin D, low potassium, and polymyalgia are next. See red flags here.

Heavy, tired legs usually mean blood pooling in leaky leg veins. Learn the signs of vein disease, PAD, anemia, and thyroid causes, plus when it is an emergency.

A tingling tongue often comes from oral allergy syndrome, dental numbing, or anxiety. Learn when B12, low calcium, or burning mouth is the cause, and stroke signs.

Hearing your heartbeat in your ear is pulsatile tinnitus. A cause is found in over 70% of workups, from ear wax and anemia to IIH. When to worry and what tests to expect.

Most eyelid twitching is harmless myokymia tied to fatigue, stress, or caffeine, and it usually stops within a week. See which signs need a doctor.

Constant thirst is often fluid loss or salty food. Ongoing, unexplained thirst can signal diabetes: a fasting glucose of 126 mg/dL or above is diagnostic.

Waking to pee at night is called nocturia. Up to 60% of older adults go twice or more a night. Learn the causes, the bladder diary, and the red flags.

Shaky hands usually come from stress, fatigue, caffeine, or a medicine. Essential tremor affects about 5.8% of people 65 and older. Know the red flags.

Sudden hair shedding often starts 3 to 4 months after illness, surgery, childbirth, or stress and is usually temporary. See the causes, tests, and red flags.

Over 90% of nosebleeds start at the front of the nose. Learn the common causes of repeat nosebleeds, how to stop one, and when frequent bleeds need a doctor.

Foamy urine is often harmless, from a fast stream or concentrated urine. Persistent foam can mean protein in the urine. A UACR over 30 mg/g needs follow-up.

Up to 60% of adults get night leg cramps. Most have no clear cause. Learn the links to age, medicines, and vascular disease, and what helps prevent them.