When you are on a weight loss journey, the shedding of every inch and kilo must be celebrated as it comes with a lot of effort. But if you are losing weight unintentionally and without any effort, along with experiencing a series of worrisome symptoms, you must investigate the reasons behind it, as it could indicate a disease that may be ruining your physical or mental health. Sudden weight loss of this kind is very different from planned weight loss, and it deserves a closer look. Put simply, sudden weight loss is a symptom to investigate, not a result of weight loss supplements. According to the Mayo Clinic, losing more than 5% of weight in the span of 6-12 months without doing any exercise or following a diet, especially, should be a cause of concern and may indicate a problem. Experts say unintentional weight loss is something that happens when you lose weight without changing your diet or exercise routine and could indicate stress or a serious disease. In such cases, reaching for weight loss supplements is never the right response; the goal is to find the cause, not mask it. What is Unexplained Weight Loss?“While typical weight loss is due to a change in lifestyle habits, decreased caloric intake, or an increase in physical activity, unexplained weight loss, or losing weight without trying, can be a cause for concern. It might indicate an underlying medical or disease. That is why one should take unexplained weight loss seriously,” says Deepti Khatuja, Head – Clinical Nutritionist, Fortis Memorial Research Institute, Gurgaon. “Many a time, a patient is brought into the hospital with a symptom of weight loss, which appears to be of great concern to the patient or his or her accompanying relatives. Unintentional weight loss is when you lose weight without changing your diet or exercise routine. It can be a sign of stress or a serious illness. Weight loss can occur in patients with normal appetites or decreased appetites. This is why sudden weight loss should never be brushed aside as a good thing.” When Should You See a Doctor?“A good rule of thumb is to see your doctor if you have lost a significant amount, more than 5 percent of your weight, within 6 to 12 months. Numerous medical conditions cause sudden, unexplained weight loss,” says Dr. Hyacinth Peninnah Paljor. It can be tempting to explain the change away or to try weight loss pills, but sudden weight loss needs a proper diagnosis, not a quick fix. Self-medicating can delay the treatment that actually matters. What are the Common Reasons for Unexpected Weight LossSome of the common reasons for unintentional weight loss are: Diabetes One of the major causes of unwanted weight loss is Type 1 diabetes (juvenile diabetes), although it may also happen in Type 2. If you have Type 1 diabetes, your immune system attacks cells in your pancreas that make insulin. Without insulin, your body can’t use glucose for energy. This results in high blood glucose. Our kidneys remove unused glucose through urine. As sugar leaves your body, so do calories, says Deepti Khatuja. “Symptoms associated are frequent urination, dehydration, fatigue, blurry vision, excessive thirst, excessive hunger. Treatment of type 1 diabetes mellitus includes insulin, blood sugar monitoring, diet, and exercise,” says Dr. Paljor. Here, sudden weight loss is a warning sign of uncontrolled blood sugar, not something to treat with weight loss pills. Cancer Cancer is a disease that causes abnormal cells to quickly divide and spread. According to the American Cancer Society, one of the first signs may be unexplained weight loss of 10 pounds or more. “This is common with cancers of the pancreas, lung, stomach, and esophagus. Cancer increases inflammation. This promotes muscle wasting and disrupts appetite-regulating hormones. A growing tumor may also increase your resting energy expenditure (REE), or how much energy your body burns at rest. Cancer cachexia is a wasting syndrome that is linked to many cancers. It’s most common in gastric and pancreatic cancers, as well as some lung, head and neck, and colorectal cancers in their later stages,” says Khatuja. “Early symptoms may be fever, fatigue, bleeding from any site, changes in moles, a lump in the breast, hoarseness of voice, or there may be no symptoms other than weight loss. Treatment depends on the type of cancer. It may include surgery, radiation therapy, chemotherapy, and immunotherapy,” says Dr Paljor. In these cases, sudden weight loss can be the earliest clue, which is why it should never be dismissed or hidden behind weight loss supplements. Tuberculosis Another cause of unexplained weight loss is tuberculosis (TB), a contagious condition that usually affects the lungs, says Khatuja. “It’s caused by Mycobacterium tuberculosis bacteria. Weight loss and decreased appetite are some of the common symptoms of TB. Although TB can affect different organs of the body, like abdominal TB, etc and unexpected weight loss is quite common,” adds the Fortis expert. TB is life-threatening and requires timely intervention. One is detected with TB while having symptoms such as constant cough, chest pain, and even unintentional weight loss. So, don’t forget to take charge of your health, says Dr. Aniket Mule, consultant internal medicine, Wockhardt Hospitals, Mira Road. Hyperthyroidism “As the thyroid oversees your metabolism, it’s understandable that thyroid problems could lead to weight gain. While having a fast metabolism can help you lose weight, having one that is too fast can be harmful. Rapid weight loss and sometimes additional complications, such as a raised heart rate, more anxiety, jitters, tremors, or insomnia, are all symptoms of an overactive thyroid (hyperthyroidism),” says Khatuja. “When the thyroid gland starts releasing an excess of its hormones, which can be due to either its hyperfunctioning state or thyroid gland damage due to infections or antibodies. Diagnosed by a simple thyroid function test,” says Dr. Johann Varghese. People sometimes mistake this sudden weight loss for a welcome change and even reach for weight loss pills, when the real fix is treating the thyroid.