Atrial fibrillation, almost always shortened to AFib, is the most common heart rhythm problem in adults. About 1 in 11 people over 65 will be diagnosed with it, and the number is climbing as the population ages. The tricky part is that AFib often shows up quietly, and many people live with it for months before they realize anything is wrong.
This is a quick guide to what AFib is, the signs that warrant attention, and when to call a cardiologist instead of waiting it out.
What AFib actually is
A normal heartbeat starts with a steady, organized electrical signal in the upper chambers of the heart, called the atria. That signal moves down through the lower chambers, the ventricles, and the heart pumps in a coordinated rhythm.
In AFib, the electrical signals in the atria become chaotic. The atria quiver instead of contracting cleanly. The ventricles still pump, but the rhythm becomes irregular and often faster than normal. Blood doesn’t move through the heart as efficiently as it should, and small clots can form in the atria, which is the main reason AFib raises stroke risk.
The good news: it’s manageable. The challenge is catching it.
The warning signs
AFib presents differently from one person to the next. Some people feel nothing. Others can’t ignore it. The most common signs include:
- Palpitations: a sensation of the heart racing, fluttering, or thumping in the chest. The most reported symptom.
- Shortness of breath: especially with mild activity that didn’t used to cause it, or while lying flat.
- Fatigue: not just tired, but a deeper drop in energy that doesn’t match what the day demanded.
- Lightheadedness or dizziness: usually brief, often when standing up or during exertion.
- Chest discomfort: pressure or tightness, sometimes mistaken for indigestion.
- Reduced exercise tolerance: the same walk or workout suddenly feels harder.
A subset of patients are completely asymptomatic. AFib in these cases is often caught during a routine EKG or after a stroke. That’s part of why screening matters.
When it warrants urgent care
Not every flutter is an emergency, but a few situations call for prompt action.
Call 911 or go to the ER if there’s chest pain that doesn’t go away, severe shortness of breath, sudden weakness on one side of the body, slurred speech, or fainting. These can indicate a heart attack or stroke and need immediate evaluation.
Call a cardiologist within a few days if there are persistent palpitations, a pulse that feels consistently irregular when checked, ongoing fatigue paired with shortness of breath, or any single AFib episode that lasted more than a few minutes.
An EKG in the office settles most questions in under a minute. If symptoms come and go, a Holter monitor or longer-term event monitor can capture the rhythm during real life rather than a brief office visit.
Risk factors that should raise the alert level
The biggest risk factors for AFib include:
- Age over 60
- High blood pressure
- Existing heart disease, including valve issues, prior heart attack, or heart failure
- Diabetes
- Sleep apnea, especially untreated
- Heavy alcohol use
- Hyperthyroidism
- Family history of AFib
Anyone with a few of these who notices new palpitations or unusual fatigue should be evaluated sooner rather than later. AFib stacked on top of these conditions raises stroke risk meaningfully, and stroke prevention is one of the main goals of treatment.
What treatment looks like
AFib treatment usually has two parts: managing the rhythm and preventing stroke.
Rhythm and rate control. Medications can slow the heart rate or convert it back to normal rhythm. For some patients, a procedure called catheter ablation is used to scar the small areas of heart tissue that trigger the abnormal signals. Many people return to a normal rhythm with one of these approaches.
Stroke prevention. Most AFib patients are placed on a blood thinner, often a newer-generation oral anticoagulant. The exact decision is based on a stroke risk score and weighed against bleeding risk.
The plan is individual. Two patients with the same AFib diagnosis can be on completely different regimens depending on age, other conditions, and lifestyle.
Getting evaluated
Anyone noticing the symptoms above doesn’t need to figure out the diagnosis at home. A cardiologist can confirm or rule out AFib quickly with an in-office EKG and sometimes a wearable monitor for a few days.
Healthy Living Heart and Vein evaluates suspected AFib at all three of their North Houston locations and runs in-office EKG and monitoring for new patients. More information on cardiology services is available at hlhv.org/locations/the-woodlands.
The earlier AFib is identified, the more options are on the table and the lower the long-term stroke risk. Waiting to see if it goes away on its own is rarely the right call.