An increased sense of smell, medically known as hyperosmia, is a common experience for many pregnant women, especially in the first trimester. While it can be one of the earliest signs of pregnancy, it’s generally not a cause for concern.

Causes of Increased Smelling Sensation

The primary reason for a heightened sense of smell during pregnancy is the significant hormonal changes occurring in the body. Specifically, the increase in hormones such as estrogen, progesterone, and human chorionic gonadotropin (hCG) is believed to be responsible. Some scientists theorize that this enhanced sense of smell may have an evolutionary purpose, helping pregnant women avoid potentially harmful substances.


Common Triggers and Associated Symptoms

Pregnant women with hyperosmia may find that certain smells, which were previously neutral or pleasant, become overwhelming and even nauseating. Common triggers include:

• Cooking odors (e.g., onions, radishes)

• Perfumes and scented candles

• Cleaning products

• Coffee

• Cigarette smoke

This heightened sensitivity to smells is often linked to morning sickness, with some studies suggesting a correlation between the two. In some cases, hyperosmia can also lead to headaches or migraines.

Management and Duration

While there’s no specific treatment to eliminate hyperosmia during pregnancy, there are ways to manage the symptoms:


• Ventilation: Keeping windows open to allow fresh air to circulate can help dissipate strong odors.

  •      Using Masking/ Neutralizing Scents : Inhale pleasant, natural scents like citrus (lemon/orange), mint, or ginger to mask or neutralize offensive smells. 

• Avoid Triggers: Identifying and avoiding specific scents that cause discomfort is crucial. This may involve asking others to refrain from wearing strong perfumes or lotions.

• Smart Cooking and Light Meals: Avoid cooking foods with pungent smells like onions, garlic, and fried items. Opt for cold foods or light meals that require minimal cooking, and delegate cooking tasks if possible.

For most women, this heightened sense of smell subsides by the end of the first trimester as hormone levels stabilize. However, for some, it may continue throughout the pregnancy.