Red flags your doctor should catch — but often doesn't

In a 15-minute annual physical, there's barely enough time to check your blood pressure and review your labs. There's certainly not enough time for your physician to ask the specific follow-up questions that distinguish "probably nothing" from "we need to investigate this." Here are the symptoms that most commonly fall through the cracks — and why a thorough clinical history matters as much as any blood test.

Unintentional weight change

Losing or gaining more than 5% of your body weight over 6–12 months without trying is clinically significant. Unintentional weight loss can signal cancer (particularly GI, lung, or hematologic malignancies), hyperthyroidism, diabetes, or depression. Unintentional weight gain can indicate hypothyroidism, Cushing's syndrome, or metabolic dysfunction. In a rushed visit, the question often isn't asked — or the answer is attributed to "stress" without further investigation.

Night sweats

Waking up drenched — not just warm, but having to change your shirt or sheets — is not normal. Causes include lymphoma (classically), infections (including tuberculosis), endocrine disorders, and medications. Most causes are benign (perimenopause in women, for instance), but lymphoma-associated night sweats have a specific pattern that a careful history can identify: drenching, often in the second half of the night, sometimes with unexplained fevers and weight loss (the "B symptoms" triad).

Changes in bowel habits

A persistent change lasting more than 3 weeks — new constipation, new diarrhea, narrower stools, or blood in the stool — warrants investigation. This is one of the most common early symptoms of colorectal cancer, and it's routinely dismissed as "probably IBS" or "dietary" without further workup. Our structured Review of Systems in the digital intake asks about bowel habits explicitly, with specific follow-up questions about duration, blood, and associated symptoms.

Persistent fatigue

Everyone is tired. That's the problem — fatigue is so universal that it's almost never investigated properly. But persistent, unexplained fatigue (more than 4 weeks, not improving with rest) can indicate anemia, thyroid dysfunction, diabetes, sleep apnea, depression, chronic infection, or — rarely but importantly — malignancy. Our DETECT panel screens for the most common causes (CBC for anemia, TSH for thyroid, HbA1c/HOMA-IR for metabolic dysfunction, ferritin and B12 for nutritional deficiency), and the STOP-Bang questionnaire flags sleep apnea risk.

New or changing moles

Most people have between 10 and 40 moles. A new mole after age 40, or any mole that changes in size, shape, color, or sensation, warrants dermatoscopic examination. This is melanoma's primary warning sign — and it's the one cancer where stage at detection determines almost everything about outcome. Our SKIN module with full-body dermatoscopy catches what self-examination and naked-eye physician checks miss.

Persistent hoarseness

Hoarseness lasting more than 3 weeks that isn't explained by a cold or voice overuse can indicate laryngeal cancer, thyroid pathology, or vocal cord paralysis (which itself can be caused by lung cancer compressing the recurrent laryngeal nerve). It's easily dismissed. It shouldn't be.