Sleep apnea can affect anyone.

However, some people have a significantly higher risk due to anatomy, lifestyle, age, or underlying health conditions.

Understanding risk factors helps identify who should consider evaluation — even before severe symptoms appear.

1. Excess body weight

One of the strongest risk factors for obstructive sleep apnea is excess weight.

Fat tissue around the neck and throat can:

• Narrow the airway
• Increase airway collapsibility
• Reduce airflow during sleep

Even moderate weight gain can worsen airway stability.

That said, not everyone with sleep apnea is overweight, and not everyone who is overweight develops apnea.

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2. Neck circumference

A larger neck circumference often correlates with increased risk.

In general:

• Men with a neck circumference over approximately 43 cm (17 inches)
• Women over approximately 38 cm (15 inches)

may have a higher likelihood of airway narrowing during sleep.

Neck anatomy matters as much as overall body weight.

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3. Male sex

Men are diagnosed with sleep apnea more frequently than women.

Possible reasons include:

• Differences in airway anatomy
• Fat distribution patterns
• Hormonal influences

However, sleep apnea in women is often underrecognized, especially when symptoms present differently.

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4. Age over 40

The risk of sleep apnea increases with age.

As people get older:

• Muscle tone in the airway decreases
• Tissues become more prone to collapse
• Sleep architecture changes

That does not mean sleep apnea is “normal aging.” It means screening becomes more important.

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5. Postmenopausal women

After menopause, the protective effect of certain hormones decreases.

Postmenopausal women may experience:

• Increased snoring
• Higher apnea risk
• More subtle symptoms, such as fatigue or insomnia

Because symptoms may differ from the typical male presentation, diagnosis can be delayed.

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6. Alcohol and sedatives

Alcohol relaxes throat muscles.

When consumed before sleep, it can:

• Increase airway collapse
• Worsen snoring
• Increase apnea severity

Sedative medications may have a similar effect.

Even mild apnea can become more severe after alcohol use.

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7. Nasal obstruction and anatomical factors

Structural issues can contribute to airway instability:

• Deviated septum
• Enlarged tonsils
• Enlarged tongue
• Small jaw (retrognathia)
• Narrow airway anatomy

In some individuals, skeletal structure plays a larger role than weight.

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8. Family history

Sleep apnea can run in families.

Inherited traits may include:

• Facial bone structure
• Airway size
• Fat distribution patterns

If close relatives have sleep apnea, your risk may be higher.

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9. High blood pressure and metabolic conditions

Sleep apnea is strongly associated with:

• Hypertension
• Type 2 diabetes
• Insulin resistance
• Metabolic syndrome

In some cases, sleep apnea contributes to these conditions. In others, they coexist and amplify risk.

Resistant high blood pressure is a particularly important warning sign.

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10. Sleeping position

Sleeping on the back can worsen airway collapse in some individuals.

Gravity causes:

• The tongue to fall backward
• Increased airway obstruction

This is called positional sleep apnea.

However, position alone rarely explains moderate or severe cases.

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Overlooked risk: normal weight individuals

It is important to recognize that sleep apnea is not limited to overweight individuals.

People with:

• Narrow airways
• Small jaws
• Certain facial structures

may develop significant apnea despite normal body weight.

This is especially important in younger adults and women who may not fit the classic profile.

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When should you consider testing?

You should consider evaluation if you have one or more risk factors and:

• Chronic fatigue
• Loud snoring
• Witnessed breathing pauses
• Morning headaches
• Difficulty concentrating

Risk factors alone do not confirm sleep apnea — but they increase the likelihood.

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The key takeaway

Sleep apnea has multiple contributing factors.

Excess weight is common, but anatomy, age, sex, hormones, alcohol use, and medical conditions also play significant roles.

If you have risk factors and feel persistently tired despite adequate sleep time, it may be worth assessing whether your breathing at night is truly normal.