RARE CARDIAC CONDITIONS YOU'VE NEVER HEARD OF (BUT SHOULD KNOW ABOUT)

By Amber McClendon | Melanin Bliss Media | February 6, 2026

INTRODUCTION: THE DIAGNOSES THAT GET MISSED

Some heart conditions are rare. But rare doesn't mean they don't matter.

In my years in healthcare, I saw these conditions misdiagnosed, dismissed, or discovered too late.

Here's what you need to know.

1. MARFAN SYNDROME

What it is: A genetic disorder affecting connective tissue (the "glue" that holds your body together). It affects the heart, blood vessels, bones, joints, and eyes.

Cardiac complications:

• Aortic aneurysm (bulging of the main artery from the heart)

• Aortic dissection (tear in the aorta—often fatal if untreated)

• Mitral valves prolapse

Symptoms:

• Tall, thin build with long limbs and fingers

• Chest that sinks in or sticks out

• Curved spine (scoliosis)

• Stretch marks not caused by weight gain

• Eye problems (lens dislocation, nearsightedness)

Why it matters: Aortic dissection can happen suddenly and is often fatal. People with Marfan syndrome need regular monitoring with echocardiograms and sometimes surgery to repair the aorta before it ruptures.

Famous people with Marfan syndrome:

• Flo Hyman (Olympic volleyball player, died from aortic dissection at age 31)

• Possibly Abraham Lincoln (debated by historians)

Diagnosis: Genetic testing, echocardiogram, family history

Treatment: Beta-blockers (slow heart rate and reduce stress on aorta), surgery if needed

2. SPONTANEOUS CORONARY ARTERY DISSECTION (SCAD)

What it is: A tear in the wall of a coronary artery, causing blood to pool between layers of the artery wall. This blocks blood flow, causing a heart attack.

Who gets it:

• Disproportionately affects women (90% of cases)

• Often occurs in young, healthy women with no traditional risk factors

• More common in the postpartum period (weeks to months after giving birth)

Symptoms:

• Sudden chest pain

• Shortness of breath

• Nausea

• Pain in arms, shoulders, or jaw

Why it matters: SCAD is often misdiagnosed because:

• It affects young women who "shouldn't" have heart attacks

• It doesn't show up on standard tests the same way traditional heart attacks do

Treatment:

• Usually managed conservatively (medications, rest)

• Sometimes requires stenting or surgery

• High recurrence rate (20-30%)

3. TAKOTSUBO CARDIOMYOPATHY ("BROKEN HEART SYNDROME")

What it is: Sudden, temporary weakening of the heart muscle triggered by severe emotional or physical stress.

Triggers:

• Death of a loved one

• Breakup or divorce

• Physical trauma

• Serious illness

• Financial stress

Symptoms:

• Identical to a heart attack: chest pain, shortness of breath, sweating

  Why it matters: Women (especially postmenopausal women) are more likely to experience Takotsubo. It can be fatal if not treated.

  Diagnosis: Echocardiogram shows ballooning of the left ventricle (looks like a Japanese octopus trap, called "takotsubo")

  Treatment: Medications (ACE inhibitors, beta-blockers), stress management

  Recovery: Most recover fully within weeks to months, but recurrence is possible

  4. HYPERTROPHIC CARDIOMYOPATHY (HCM)

  What it is: The heart muscle becomes abnormally thick, making it harder for the heart to pump blood.

  Why it matters:

  • Leading cause of sudden cardiac death in young athletes

  • Often goes undetected until a fatal event

  Symptoms:

  • Shortness of breath (especially during exercise)

  • Chest pain

  • Fainting

  • Heart palpitations

  Diagnosis: Echocardiogram, cardiac MRI, genetic testing

  Treatment:

  • Medications (beta-blockers, calcium channel blockers)

  • Implantable cardioverter-defibrillator (ICD) if high risk for sudden death

  • Surgery to remove excess heart muscle (septal myectomy)

  Famous cases:

  • Many young athletes who died suddenly during games had undiagnosed HCM

  5. POSTURAL ORTHOSTATIC TACHYCARDIA SYNDROME (POTS)

  What it is: A disorder of the autonomic nervous system causing rapid heart rate increase when standing up.

  Symptoms:Lightheadedness or fainting when standing

• Rapid heartbeat (increase of 30+ bpm within 10 minutes of standing)

• Fatigue

• Brain fog

• Nausea

Triggers:

• Viral infections (including COVID-19)

• Pregnancy

• Surgery

• Trauma

Why it matters: POTS is often dismissed as "anxiety" but is a real physiological condition.

Diagnosis: Tilt table test (monitors heart rate and blood pressure as table tilts upright)

Treatment:

• Increase salt and fluid intake

• Compression stockings

• Medications (beta-blockers, midodrine)

• Physical therapyMB'S TAKE: RARE ≠ UNIMPORTANT

  If you have symptoms that don't fit the typical "heart attack" profile—especially if you're young, female, or have been dismissed by doctors—don't give up.

  Ask for:

  • Echocardiogram

  • Holter monitor

  • Referral to a cardiologist

  • Genetic testing if family history suggests it

  Your symptoms are real. Your life matters.

  SOURCES:

  • Marfan Foundation, marfan.org

  • SCAD Alliance, scadalliance.org

  • American Heart Association, Takotsubo Cardiomyopathy

  • Hypertrophic Cardiomyopathy Association, 4hcm.org

  • Dysautonomia International, POTS information