14 Physical Anorexia Symptoms

2. Anemia

Severe food restriction can lead to anemia when your body does not get enough iron and nutrients. Your blood then carries less oxygen to your tissues, which affects how your whole body works. You may feel tired most of the time, and even simple tasks, like walking up stairs, can leave you short of breath.

You might also feel dizzy or lightheaded when you stand up. Your skin may look pale, and your hands and feet can feel cold, while some people notice a fast heartbeat or frequent headaches. If you menstruate, your periods may stop, but anemia can still occur.

Doctors can find anemia through a simple blood test that checks your red blood cells and iron levels. Low results suggest your body does not have what it needs to make healthy blood. Without enough nutrients, you cannot repair and maintain your body. Over time, anemia strains your heart and lowers your ability to focus.

3. Thinning Hair

Your hair may become thin, dry, or brittle when you have anorexia. Your body needs enough calories, protein, and nutrients to grow and maintain healthy hair. When you do not eat enough, your body shifts its energy to protect vital organs instead of supporting hair growth.

Hair may fall out more than usual when you brush or wash it, and you might see more strands on your pillow or in the shower drain. Over time, your hair can look flat, dull, and less full. Poor nutrition disrupts the hair growth cycle, and hair can move from a growing phase into a resting phase too soon, which leads to shedding.

Low levels of iron, protein, and certain vitamins often play a role in this change. Some people with anorexia also develop fine, soft body hair called lanugo. Your body grows this hair in response to low body fat and low body temperature. At the same time, the hair on your scalp may thin.

4. Insomnia

Insomnia means you have trouble falling asleep, staying asleep, or both. With anorexia, this problem often becomes more common as your body loses weight and energy. You may lie awake for long periods or wake up many times during the night.

When you do not eat enough, your body lacks the fuel it needs to rest. Low body weight can upset your hormones, including those that help control sleep. You may also feel cold at night, which makes it harder to stay asleep.

Mental stress plays a role as well, and you might think about food, weight, or calories while trying to sleep. Anxiety and depression, which often occur with anorexia, can also disturb your normal sleep pattern. Poor sleep can weaken your immune system and lower your mood, and make it harder to think clearly or manage emotions.

5. Body Hair

You may notice changes in your body hair when you have anorexia. Your body reacts to low weight and low body fat in ways that try to protect you. One common change is the growth of fine, soft hair on your arms, back, or face called lanugo. It often appears when your body fat drops too low.

Lanugo grows because your body tries to stay warm, and with little body fat, you lose heat more easily. Your body responds by growing extra hair to help trap warmth. At the same time, you may lose hair from your scalp, and your hair can become thin, dry, and brittle.

You might see more hair fall out when brushing or washing it because the body lacks enough nutrients. When you do not eat enough, your body sends limited energy to vital organs like your heart and brain. Hair growth becomes less important, so normal hair can shed.

6. Menstrual Cycle Disruption

Anorexia can disrupt your menstrual cycle. When your body weight drops too low, you may stop ovulating. Without ovulation, your period can become irregular or stop completely. You may notice that your periods come less often, are very light, or do not come at all. This is called secondary amenorrhea, which means you miss periods after having normal cycles in the past.

Some people also have delayed first periods if anorexia starts at a young age. Your body needs enough fat and nutrients to produce hormones that control your cycle, and when you restrict food, hormone levels fall. This change affects signals between your brain and ovaries, which interrupt your monthly cycle. Menstrual changes can last for months, and in some cases, your period does not return until you restore a healthier weight and improve your nutrition.

7. Gastrointestinal Problems

When you do not eat enough, your digestive system slows down. Your body tries to save energy, so it moves food through your stomach and intestines more slowly. You may feel bloated after eating small amounts of food, and your stomach may feel full, tight, or painful.

Some people also notice nausea or a burning feeling in the chest. Constipation is common, and you may have fewer bowel movements, and passing stool can feel hard or painful. This happens because you lack enough food, fiber, and fluids to keep digestion regular.

You might also deal with stomach cramps or gas, which make eating feel uncomfortable, which may lead you to avoid food even more. Some people misuse laxatives to try to control weight. This can irritate your intestines and lead to more severe constipation later, and upset your body’s fluid balance.

8. Dehydration

When you have anorexia, you may not drink enough fluids. You might also lose fluids through vomiting, laxative misuse, or excessive exercise. This can lead to dehydration, which means your body does not have the water it needs to work well.

Dehydration can start with mild signs, and you may feel very thirsty or notice that your mouth feels dry. Your urine may turn dark yellow, and you may urinate less often than usual. As dehydration gets worse, other symptoms can appear. You may feel dizzy, weak, or lightheaded, especially when you stand up.

Headaches and trouble focusing are also common. Your heart may beat faster as your body tries to keep blood flowing. Severe dehydration can become dangerous, and you may faint or feel confused. Low fluid levels can strain your kidneys and upset the balance of salts in your blood, which affects how your muscles and heart work.

9. Heart Problems

Anorexia can place serious stress on your heart. When you do not eat enough, your body lacks the fuel it needs to keep your heart muscle strong. Over time, this can weaken how well your heart works. You may notice a slow or irregular heartbeat, with a faint pulse or fluttering feeling in your chest.

Some people also develop low blood pressure, which can make you feel lightheaded or dizzy when you stand up. Severe weight loss can cause your heart muscle to shrink. This makes it harder for your heart to pump blood through your body.

As a result, you may feel tired, short of breath, or weak even with mild activity. Electrolyte imbalances also raise the risk of heart rhythm problems. When levels of minerals like potassium drop too low, your heart’s electrical system can misfire.

10. Bone Loss

Bone loss is a serious physical effect of anorexia. When you do not eat enough, you lack calcium, vitamin D, and other nutrients that keep your bones strong. Over time, your bones become thin and weak. This condition can lead to osteoporosis, a disease where bone mass and strength decrease.

Weak bones break more easily, even from a small fall or minor injury. You may not notice bone loss at first because it often has no clear symptoms until a fracture happens. Hormone changes also play a role. If you are female, you may lose your menstrual period due to low body weight. This drop in hormone levels reduces bone strength.

If you are male, low hormone levels can also weaken your bones and lower your sex drive. Bone loss can start during the teen years, which is when your body should be building strong bones. If anorexia begins at a young age, it can limit how much bone mass you gain. This can affect your bone health for many years.

11. Edema

Edema is swelling caused by fluid buildup in your body tissues. With anorexia, you may notice this swelling in your feet, ankles, legs, or even your hands and face. The skin can look puffy and feel tight. When you do not eat enough protein or calories, your blood protein levels drop.

Protein helps keep fluid inside your blood vessels. Low levels allow fluid to leak into nearby tissues, which leads to swelling. When you start eating again after a period of severe restriction, your body shifts fluids and salts as it adjusts to food. This shift can cause sudden swelling and quick weight gain from fluid, not fat.

12. Dental Problems

Anorexia can cause serious problems with your teeth and gums. When you do not eat enough, your body lacks key nutrients like calcium and vitamin D. Your teeth may weaken over time, and your gums may become more likely to bleed or pull away from the teeth.

If you vomit often, stomach acid wears down your tooth enamel. Enamel is the hard outer layer that protects your teeth. Once it breaks down, your teeth may look yellow, feel sensitive, or chip more easily. You may notice pain when you eat hot, cold, or sweet foods.

You may also develop more cavities. Poor nutrition or dehydration can cause a dry mouth and lower the amount of saliva, which helps wash away food and bacteria. Without enough saliva, bacteria grow faster and increase your risk of tooth decay and gum disease.

13. Food Cravings

Anorexia often causes strong and frequent thoughts about food. Even if you restrict what you eat, your body still needs energy, which can lead to intense cravings. You might crave foods you label as “off limits,” such as sweets, bread, or high-fat snacks.

Your body reacts to long periods without enough food. Hunger hormones increase, and your brain becomes more focused on food. You may think about meals often, read recipes, or watch cooking shows but still avoid eating. Cravings can also lead to cycles of strict control followed by episodes of overeating, and afterward, you may feel guilt or shame.

Physical signs may appear along with cravings. You may feel shaky, tired, or lightheaded when you have not eaten enough. These symptoms show that your body is trying to get the fuel it needs. Food cravings in anorexia are not a lack of willpower, but a normal biological response to hunger and low body weight.

14. Immune System Problems

Not eating enough deprives your body of essential nutrients needed for immune defense. Your immune system relies on protein, vitamins, and minerals to fight germs, and without them, it cannot work at full strength. As a result, your body becomes more vulnerable to illness and infection.

You may notice that you get sick more often, and colds can last longer than usual. Small infections, such as skin sores or sinus infections, may take more time to heal. Low body weight also lowers your white blood cell count. These cells help your body attack bacteria and viruses. When levels drop, your body struggles to respond quickly to illness.

Poor nutrition weakens your gut, where much of your immune defense begins. If your digestive system does not absorb nutrients well, the problem worsens. This creates a cycle where your body becomes more run down over time.