When to seek care for weight loss

Overview

Unintentional weight loss means losing weight without trying — for example, when you are not dieting or exercising more than usual. This can sometimes be a sign of an underlying health issue, but it is not always serious.

Yes, many people experience unintentional weight loss at some point. It becomes more common as we age.

It can affect anyone, but older adults and people with long-term health conditions may be more at risk.

Symptoms

Common symptoms

• Losing weight without changing your diet or exercise habits
• Noticing that clothes fit more loosely than before
• Feeling tired or weak
• Loss of appetite

Symptoms in children

• Not gaining weight as expected for their age
• Growing more slowly than their peers
• Seeming less energetic or playful than usual

Symptoms in older adults

• Unintentional weight loss that is more than 5% of body weight over a year
• Loss of muscle mass or strength
• Difficulty with daily activities due to weakness or fatigue

Causes

Main causes

• Overactive thyroid (hyperthyroidism): your thyroid gland makes too much hormone, speeding up your metabolism
• Diabetes: especially type 1, where the body cannot use sugar for energy properly
• Depression or anxiety: changes in appetite and mood can lead to weight loss
• Digestive problems: such as coeliac disease, Crohn's disease, or an infection in the gut
• Chronic infections: like tuberculosis or HIV

When to see a doctor

See a doctor urgently if:

• If you have lost 5% or more of your body weight over the past 6 months without trying
• If you have weight loss along with a fever, pain, or night sweats
• If you have trouble swallowing or vomiting that lasts more than a day

Book a routine appointment if:

• If you have been slowly losing weight over a longer period and are not sure why
• If you feel tired, weak, or have lost your appetite for more than a few weeks

Diagnosis

Your doctor will ask about your weight changes, diet, activity, and any other symptoms. They will also perform a physical examination and may ask about your medical history.

Tests that may be done

• Blood tests to check for thyroid problems, diabetes, infections, and nutrient levels
• Urine test
• Imaging tests like a chest X-ray or CT scan if needed
• Tests on your digestive system, such as an endoscopy or colonoscopy, if there are digestive symptoms

What to expect at your appointment

Your doctor will work with you to find the cause. This may take a few appointments. They may refer you to a specialist depending on what they suspect. Most causes can be treated or managed once found.

Treatment

Treatment depends on what is causing the weight loss. Once the cause is found, your doctor will recommend the best approach. This may include managing an underlying condition, making changes to your diet, or getting support for mental health.

Self-care at home

• Keep a diary of your weight, meals, and any symptoms to share with your doctor
• Eat small, frequent meals if you have a poor appetite
• Choose nutrient-rich foods like eggs, avocado, and whole grains

Medical treatments

If a condition like an overactive thyroid or diabetes is found, your doctor may prescribe medications to help control it. For depression or anxiety, talking therapy or antidepressants may be offered. For digestive problems, dietary changes and sometimes medicines can help. If an infection is the cause, antibiotics or other treatments may be given. Your doctor will discuss the options with you.

When is surgery considered?

Surgery is rarely needed for weight loss itself, but it may be part of treating an underlying cause, such as removing a tumour or repairing a digestive problem.

Living with this condition

Focus on eating regular, balanced meals and staying active if you can. Keep in touch with your doctor for follow-up appointments. If the cause is under control, your weight will often stabilise.

Lifestyle tips

• Eat a balanced diet with plenty of fruits, vegetables, and protein
• Stay physically active within your limits
• Get enough rest and manage stress

Diet and exercise

A diet rich in calories and nutrients can help you regain weight. Gentle exercise like walking or stretching can help improve appetite and mood. Your doctor or a dietitian can give personalised advice.

Mental health and emotional wellbeing

Unintentional weight loss can be worrying and may cause stress. If you feel anxious or depressed, talk to your doctor. They can offer support or refer you to a mental health professional.

Prevention

You cannot always prevent unintentional weight loss, especially if it is caused by an underlying health condition. However, staying on top of your overall health and seeing a doctor for any ongoing symptoms can help catch problems early.

Complications

If left untreated

• Muscle wasting and weakness
• Weakened immune system, making it easier to get infections
• Nutrient deficiencies that can affect bones, skin, and organ function
• Delayed diagnosis of an underlying serious condition

Long-term outlook

With proper medical care, most causes of unintentional weight loss can be treated or managed. Many people regain weight and feel better once the underlying issue is addressed. Early diagnosis leads to the best outcomes.

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