Aerobic capacity, or VO2 max, measures how well your body delivers and burns oxygen and ranks among the strongest markers of fitness and long-term health. Learn its benefits, evidence-based ways to raise it, and how variants like PPARGC1A, ACE, and ACTN3 add pathway-level context to trainability.

Motion sickness is highly heritable: a 23andMe genome-wide study found 35 markers tied to susceptibility, including variants near PVRL3 and TSHZ1. This article explains the sensory-conflict mechanism, the genes and neurotransmitter pathways involved, and evidence-based ways to manage symptoms while traveling.

Biotin (vitamin B7) powers the carboxylase enzymes that turn food into energy and supports skin, hair, and nails. The BTD gene recycles biotin, and variants like rs13078881-C can raise your needs. Learn biotin's benefits, deficiency risks, and how PlexusDx pathway insight helps.

Hay fever, or allergic rhinitis, is driven by an IgE and histamine immune pathway and shaped by genes including IL33, IL1RL1, TSLP, and FLG. This article explains the biology behind seasonal and perennial symptoms, evidence-based management options, and how pathway-level genetic insight fits alongside provider-led allergy care.

Multiple sclerosis is polygenic: more than 200 variants shape susceptibility, led by HLA-DRB1*15:01, with IL7R, IL2RA, and vitamin D pathway genes adding immune-regulation context. Genetics loads the dice alongside Epstein-Barr virus and vitamin D. Learn how these named variants work — educational insight, not diagnosis.

Nail-biting (onychophagia) is a body-focused repetitive behavior with a real, inherited genetic component. Named genes including SAPAP3 (DLGAP3), SLITRK1, and COMT shape the brain grooming and habit circuitry. Learn the genetic factors behind nail-biting and evidence-based, habit-reversal strategies to manage it effectively.

Ear pain can start in the ear itself or be referred from the jaw, teeth, throat, or sinuses. Learn the common causes, safe ways to find relief, when to see a provider, and how genes like A2ML1 and TLR4 shape susceptibility to recurrent ear infections.

DNA can affect hemorrhoid risk: a 2021 genome-wide study found over 100 gene regions tied to hemorrhoidal disease, many in connective-tissue and vascular genes like ELN, COL5A2, and MYH11. This article explains the genetics of vein and tissue integrity, modifiable risk factors, and how pathway-level genetic insight fits with prevention.

Narcolepsy type 1 has one of the tightest gene links in medicine: over 98 percent of cases carry HLA-DQB1*06:02, alongside TRA and P2RY11 immune variants and the loss of hypocretin neurons. This article explains the genetic factors, autoimmune triggers, and how sleep specialists evaluate the disorder.

Gangrene is tissue death from lost blood supply or infection, and it is a medical emergency. This article explains the types, causes, and symptoms of gangrene, the genetic factors behind underlying risks like clotting (F5, F2) and diabetes (TCF7L2), and how clinicians treat it.

High haptoglobin often signals background inflammation and oxidative stress — two processes tied to aging. The HP gene's Hp1/Hp2 polymorphism shapes how efficiently this protein clears free hemoglobin. Learn what elevated haptoglobin means for longevity and how pathway-level genetics adds context.

Most nosebleeds are harmless, but recurrent or heavy ones can be genetic. Variants in ENG and ACVRL1 cause hereditary hemorrhagic telangiectasia, and VWF variants cause von Willebrand disease. This article explains the named genes, warning signs, and where pathway-level genetic insight fits into provider-led care.

Autism is 60 to 90 percent heritable, driven by hundreds of genes rather than one. Variants in SHANK3 affect synaptic scaffolding and CHD8 regulates neurodevelopment. Learn what genetic factors in ASD mean and where pathway-level education fits.

Genetic factors in the FADS1, FADS2, and ELOVL2 genes strongly affect how efficiently your body converts ALA (alpha-linolenic acid) into the long-chain omega-3s EPA and DHA. This article explains the key variants behind omega-3 status, why conversion varies so widely, and what a pathway-level genetic test can and cannot reveal.

Painful urination, or dysuria, most often signals a urinary tract infection, but stones, prostate issues, and other causes are possible. This article covers the common causes, the genetics of UTI susceptibility — including CXCR1 and TLR4 variants — and why prompt medical evaluation matters.

Phobias are moderately heritable, shaped by how readily the brain's fear circuitry fires. This article explains the genes involved — including COMT Val158Met and the serotonin transporter SLC6A4 — what twin studies show, and how pathway-level genetic insight puts your fear-system biology in context.

Peptic ulcers are driven mainly by H. pylori and NSAIDs, but genetics shapes who is susceptible. This article explains ulcer causes and symptoms, the inflammatory genes involved — IL1B, IL1RN, TNF — and ABO blood type, plus how pathway-level genetic insight supports your provider conversation.

Paresthesia — tingling, numbness, and pins-and-needles — is influenced by genetics, including MTHFR variants affecting B12 and folate metabolism, SCN9A variants shaping nerve firing, and PMP22 affecting myelin. This article explains the genetic factors in nerve health and how genetic insight supports an informed provider conversation.

Albumin, the most abundant blood protein, has a genetically influenced baseline. The ALB gene, the GCKR variant rs1260326, and FCGRT-driven albumin recycling all shape your level. Learn what these named gene variants do and why pathway-level genetics complements, but never replaces, a provider's reading of your labs.

Neutropenia — a low neutrophil count below 1,500 cells per microliter — has causes ranging from harmless to serious. This guide explains the symptoms, common triggers, and named genetic factors like the ACKR1 Duffy variant, ELANE, and MTHFR that shape your baseline neutrophil biology.

Peripheral artery disease (PAD) narrows the arteries feeding the legs, driven mainly by atherosclerosis and smoking. Genome-wide studies link risk to the 9p21 locus (CDKN2B-AS1), MTHFR, and smoking-related genes. Learn PAD's causes, warning signs, and how pathway-level genetic insight informs your provider conversation.