Explore questions from across science through evidence, mechanisms, limitations, and the explanations behind familiar claims.
Find an explanation ↓
Yes, lower back pain can cause abdominal pain, but almost always through referred or shared-nerve mechanisms rather than direct spread. The lower back and abdomen share nerve roots, fascia, and the same T10 through L2 spinal segments.
Read the story ↗Yes, low iron can make you lightheaded, and the mechanism is oxygen logistics rather than a vague "weakness."
Low dopamine does not directly cause headaches or migraines in the way a pinched nerve causes pain. Dopamine cannot trigger pain fibers, so there is no direct line from low dopamine to a headache.
Yes: low iron can cause low oxygen levels, but only indirectly and only at a specific stage. Iron is the core of every hemoglobin molecule, and hemoglobin carries 98.5 percent of the oxygen in your blood.
Yes, low iron can cause vertigo and dizziness, and the mechanism is oxygen delivery, not the inner ear. Iron is the core atom of hemoglobin, the protein that carries oxygen in your blood.
Yes, low estrogen can cause painful intercourse, and it does so through a specific, measurable mechanism: estrogen withdrawal thins the vaginal epithelium, depletes glycogen and lactobacilli, raises vaginal pH above 5.0, and reduces…
Yes, low cortisol can cause weight gain, but not through the mechanism most people assume.
Yes, low calcium can cause seizures. Hypocalcemia lowers the threshold at which nerve cells fire, and when ionized calcium falls far enough, the brain and peripheral nerves begin discharging spontaneously.
Yes, liver scarring can be reversed in its early and intermediate stages, but not in its final stage.
Yes, low estrogen can cause fatigue, and it does so through at least four measurable pathways rather than one vague effect.
Yes, losartan can cause itching and allergic reactions, but the two are not the same thing. Itching without a rash is a recognized but uncommon side effect, reported in roughly 1 percent of patients in trials.
Yes, liver disease can cause peripheral neuropathy, and it does so through at least four distinct mechanisms: direct neurotoxicity from ammonia and bile acids, nutritional deficiencies (especially vitamins B1, B6, B12, and E),…
Yes. Liver problems can cause shortness of breath, but almost never by damaging the lungs directly.
Yes, liver problems can cause gas and bloating, but usually through indirect routes rather than the liver itself producing intestinal gas.
Levothyroxine does not usually cause low blood pressure. It is a synthetic form of thyroxine (T4) that raises metabolic rate, heart rate, and contractility, so its more typical cardiovascular effect is a mild rise in blood pressure.
Lion’s mane (Hericium erinaceus) is not a classic cause of depression, but it can produce depression-like symptoms in a minority of users through indirect pathways: sleep disruption, digestive distress, rare immune hypersensitivity, and…
Yes, leaking urine can be a sign of a UTI, but the relationship is indirect.
Levothyroxine itself does not directly damage the kidneys in most people; the drug is a synthetic copy of your own thyroid hormone, and at replacement doses it has no known direct nephrotoxic effect.
Yes, a lipoma can shrink on its own without surgery, but only under specific conditions and far less often than most people hope.
Learning disabilities cannot be cured, but they can be managed with high effectiveness. A learning disability is a lifelong difference in how specific brain networks process language, numbers, or visual-spatial information.
Yes, lidocaine can make you sleepy or drowsy, but usually only when enough of it reaches the bloodstream. At normal numbing doses, such as a dental injection or a small skin repair, drowsiness is uncommon.
Yes, limbs can be transplanted. Surgeons have performed vascularized composite allotransplantation (VCA) of hands and arms since 1998, with more than 100 upper-limb transplants reported worldwide and roughly 90 percent of grafts still…
Yes, letrozole can cause hair loss, but it is an uncommon side effect rather than a typical one.
Levothyroxine itself does not usually cause brain fog. When cognitive symptoms appear or persist on levothyroxine, the cause is almost always one of four things: the dose is too low (under-replacement), the dose is too high…
AI-generated editorial images · Image policy
Show Me