Heart disease is the #1 killer worldwide.
And after 25 years at the bedside, I can tell you our bodies do a phenomenal job at signaling that something is wrong.
The problem?
We don't always do a great job listening — or responding — to those signals.
We dismiss shortness of breath as "I'm just getting older."
We brush off fatigue as "I'm out of shape."
We scale back our lives around symptoms instead of investigating them. We park closer to the store. We take the elevator. We stop walking the long route.
That can be a dangerous game.
In today's newsletter, we will unpack 10 of the most commonly ignored warning signs and symptoms that your heart is trying to tell you something.
The Three Buckets of Heart Disease
Before we get into the symptoms, here is a simple framework.
Almost every heart problem I see falls into one of three buckets:
- A fuel problem. Blockages in the coronary arteries that supply the heart muscle, limiting oxygen and nutrients.
- A structural problem. Heart valves that are blocked (stenotic) or leaking.
- An electrical problem. Heart rhythms that are too fast, too slow, or irregular.
The tricky part? These three buckets can cause overlapping symptoms.
That's why the goal of this newsletter isn't to diagnose you — it's to raise a flag so you get evaluated and determine which bucket (if any) you're in.
Let's get into it.
1. Chest Pain or Discomfort
The classic "TV heart attack symptoms".
Most people describe it as pressure, tightness, or "an elephant sitting on my chest" — not a sharp, sticking pain.
Many patients tell me it wasn't really pain at all. Just discomfort.
Here's when it's worth investigating:
Comes on with activity, goes away with rest. That's a red flag for cardiac angina and deserves evaluation.
Predictable with the same level of exertion every time. This is called stable angina and should be evaluated by a cardiologist.
Comes on at rest, with no exertion at all. This is a 911 call. You've outstripped the blood supply to your heart muscle without even moving.
2. Shortness of Breath
I'm not referring to being winded after a hard run or a HIIT workout.
I'm talking about getting short of breath walking up a flight of stairs, carrying in groceries, or going to the mailbox.
Here's why this happens.
If your heart isn't pumping efficiently, fluid backs up into your lungs. That extra fluid prevents normal gas exchange, and you feel breathless. It's one of the earliest and most under-appreciated signs of heart inefficiency.
3. Arm or Shoulder Pain
We're classically taught: left arm pain = heart attack.
That's true — but not absolute.
It can be the left arm, the right arm, both arms, or pain between the shoulder blades.
I once had a patient who presented with pain at the tip of her elbow every time she took the garbage out. She saw an orthopedist for months before someone recognized it as referred pain from her heart.
Why does this happen?
Your heart shares neural pathways with the sensory nerves from your upper extremities. When those signals cross, your brain can't always tell the difference.
Heart pain is the great masquerader.
4. Jaw and Neck Pain
Same biology, different location.
Unusual discomfort on one side of the jaw, both sides of the jaw, or the back of the neck — particularly if it comes on with exertion — can be referred pain from the heart.
We see this more commonly in women.
If it's new and unexplained, it deserves evaluation.
5. Unusual Fatigue
This is the easiest one to brush off.
"I'm just getting older.""I didn't sleep well.""I'm out of shape."
I'm not talking about normal tired.
I'm talking about fatigue disproportionate to the activity.
You meet a friend for coffee in the afternoon and come home so wiped out that you have to lie down for an hour.
You used to walk three miles. Now you make it a mile and a half before you need to sit down.
The dangerous part is how easy this one is to scale away. We slowly shrink our lives to accommodate the symptom and convince ourselves that nothing is wrong.
I've done it myself.
Pay attention to fatigue that is extreme, disproportionate, or progressive over time.
6. Lightheadedness or Feeling Like You're Going to Faint
This one crosses all three buckets.
Fuel problem: the heart isn't getting enough blood supply to pump effectively.
Valve problem: a critically blocked aortic valve can cause near-fainting with even minimal exertion — and it's a precursor to sudden death.
Electrical problem: a heart rate that's too slow or too fast can drop blood flow to the brain.
If it happens once when you stand up too quickly and passes immediately, probably nothing.
But if it becomes persistent — or happens with exertion — that should prompt evaluation.
7. Cold Sweats
Not the sweat from a workout.
I mean that clammy, wet-not-showered feeling — the kind you get right before you come down with the flu.
When we walk into a hospital room and see this, we know something significant is off. The autonomic nervous system is under serious stress.
On its own, it's not specific to the heart.
But paired with chest pressure, shortness of breath, or a feeling of impending doom — that's when it's a major red flag.
8. Nausea and Vomiting
I know this sounds strange, but your heart can make you feel like you have the flu when something is wrong.
Nausea, vomiting, and even reflux-type symptoms.
These "softer" symptoms are more common in women, but they're not exclusive to women — they were the symptoms I had during my own heart issue.
The danger is that flu-like symptoms get explained away.
There's a real and well-documented delay in diagnosis for patients who present this way.
9. Palpitations
Now, let me say this clearly:
The vast majority of palpitations are not dangerous.
They are usually benign, self-limited changes in heart rate or rhythm.
It's concerning when:
They come on suddenly and are persistent or become more regular over time, and they're paired with chest pressure, shortness of breath, or radiating pain.
The most common diagnosis we worry about here is atrial fibrillation, where the top of the heart beats irregularly and inefficiently. AFib tends to become more persistent over time, not less if untreated.
If the frequency is increasing or it's becoming the new normal, get it checked.
10. Swelling in the Legs, Ankles, or Abdomen
When both legs, both ankles, or the abdomen swell up — and it's not from an injury — this is often a sign of heart failure.
Heart failure isn't a heart that has stopped. It's a heart that's no longer pumping efficiently.
When the pump weakens, fluid backs up. And gravity pulls that fluid to the lowest point in the body — your legs and ankles.
Patients usually wake up looking better in the morning, but the swelling never fully goes away.
This is the final common pathway for many of the issues above. Which is why, in retrospect, many of the signs or symptoms above were present all along.
The One Symptom That Means Call 911 Right Now
Most of the symptoms above give you the latitude of time to evaluate and call your doctor.
But not this one.
If you — or someone you're with — is having ongoing, crushing chest pain that is not going away, with or without shortness of breath, radiating into the jaw, neck, or back:
That is a 911 call.
Not your spouse.
Not your friend.
Don't drive yourself.
Don't drive someone else.
Call 911.
Treatment can begin in the ambulance on the way to the hospital — and when it comes to saving heart muscle during a heart attack, time equals heart muscle saved.
Listening Isn't Enough — You Have to Respond
Our bodies are incredibly intelligent.
They give us signals.
But signals don't save lives.
Action does.
Listening is step one. Responding — getting evaluated, calling your doctor, picking up the phone — is what determines the outcome.
Acting early is where the true wins occur in cardiac care.
If anything in this newsletter sounded familiar, don't explain it away.
Don't shrink your life around it.
Get evaluated.
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Only the best,
Jeremy London, MD
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