Heart Attack Warning Signs (Know These First)
If you notice these signs, treat it as an emergency.
- Chest pressure, squeezing, tightness, or pain that lasts more than a few minutes (or comes and goes).
- Pain spreading to the arm (often left), shoulder, back, neck, or jaw.
- Shortness of breath (with or without chest discomfort).
- Cold sweat, nausea, or vomiting that feels sudden and unusual.
- Lightheadedness, dizziness, or fainting.
- Extreme fatigue or a sudden “something is very wrong” feeling, especially if it’s new for you.
This article is for general education, not diagnosis. When in doubt, get checked.
What Is a Heart Condition Like ATTR-CM?
ATTR-CM (transthyretin amyloid cardiomyopathy) is a type of heart condition where an abnormal build-up of protein
(called amyloid) can make the heart muscle stiff. A stiff heart has trouble relaxing and filling with blood between
beats. Over time, this can lead to symptoms that look like heart failure—often mistaken for “getting older” or being
“out of shape.”
Common Signs Your Heart May Not Be Working Normally
Heart conditions can show up in different ways. Some symptoms are loud and obvious. Others are sneaky and build slowly.
If you notice several of the signs below—especially if they are new or getting worse—talk to a healthcare professional.
1) Shortness of Breath (Especially With Simple Activities)
Feeling breathless while climbing stairs, walking quickly, or doing chores can be a sign the heart isn’t pumping
effectively or isn’t filling well. You might also notice you get winded faster than you used to—even if your routine
hasn’t changed.
2) Swelling in the Feet, Ankles, Legs, or Belly
When the heart struggles, fluid can build up in the body. Shoes may feel tighter, socks may leave deeper marks, or you
might notice puffiness around the ankles. Some people also gain a few pounds quickly from fluid, not food.
3) Fatigue That Feels “Heavy” and Out of Proportion
Tiredness happens for many reasons, but heart-related fatigue often feels like your battery is stuck at 10%. You may
feel wiped out after normal tasks, or need more rest than before. In ATTR-CM, fatigue can gradually get worse over months.
4) Rapid, Irregular, or “Fluttering” Heartbeat
Palpitations can feel like a racing heart, skipped beats, or a flutter in the chest. Some heart conditions raise the
risk of abnormal rhythms (like atrial fibrillation), which can cause weakness, dizziness, or breathlessness.
5) Chest Discomfort (Not Always Sharp Pain)
Chest symptoms aren’t always dramatic. Some people describe pressure, fullness, tightness, or burning—especially during
exertion. If chest discomfort is sudden, severe, or paired with sweating or nausea, treat it urgently.
6) Dizziness, Near-Fainting, or Fainting
If blood flow to the brain dips—because of rhythm issues, low blood pressure, or reduced cardiac output—you may feel
dizzy when standing up or even faint. This is a “don’t ignore it” symptom.
7) Trouble Sleeping Flat or Waking Up Short of Breath
Needing extra pillows, feeling better when propped up, or waking up gasping can be signs of fluid shifting into the lungs.
This can happen in heart failure and should be evaluated.
Extra Clues That Can Show Up With ATTR-CM
ATTR-CM can sometimes come with signs outside the heart. Not everyone has these, but they can be helpful clues:
- Carpal tunnel syndrome (numbness/tingling in the hands), sometimes years before heart symptoms.
- Back or spinal stenosis (narrowing in the spine) or unexplained nerve symptoms.
- History of heart thickening on an echo without a clear reason (like long-term high blood pressure).
When to Get Checked (And What to Track)
If symptoms are new, worsening, or limiting your daily life, it’s worth getting evaluated. Helpful details to track:
when symptoms started, what triggers them (stairs, walking, lying flat), whether swelling comes and goes, and any episodes
of dizziness or racing heartbeat. Bringing this “symptom timeline” can speed up a proper workup.
Bottom Line
Conditions like ATTR-CM can look like common “heart failure” symptoms—shortness of breath, swelling, fatigue, and rhythm
changes—often building slowly. The earlier a heart issue is identified, the more options there are to manage symptoms and
protect quality of life. If you’re seeing patterns, don’t brush them off as “just age” (age is not a diagnosis).