For example, thyroid disorders and anemia can sometimes contribute to symptoms that resemble depression or persistent fatigue.
Mental health symptoms should not be dismissed as weakness or a lack of willpower.
If emotional changes persist for several weeks or interfere with work, relationships, sleep, or daily activities, speaking with a qualified healthcare professional can be an important first step.
If someone experiences thoughts of self-harm or suicide, they should seek immediate support from emergency services, a crisis service, or a trusted healthcare professional.
Mental health deserves the same attention and care as physical health.
41. Headaches: Recognizing the Difference Between Common and Dangerous Symptoms
Headaches are common and may be associated with stress, dehydration, poor sleep, eye strain, migraine, or tension in the neck and shoulders.
However, some headache patterns require urgent attention.
Seek emergency assessment for a headache that:
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Begins suddenly and reaches maximum intensity within seconds or minutes.
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Is the worst headache the person has ever experienced.
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Occurs with weakness, confusion, seizures, fainting, or speech difficulty.
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Appears after a significant head injury.
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Is accompanied by fever and a stiff neck.
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Occurs with sudden vision loss.
A new or progressively worsening headache in an older adult, or a headache associated with cancer, immune suppression, or pregnancy, also deserves prompt medical assessment.
Keeping a headache diary can be helpful. Record when the pain begins, how long it lasts, where it occurs, possible triggers, and associated symptoms.
This information may help a clinician identify patterns and recommend appropriate treatment.
42. Night Sweats and Persistent Fever
Sweating during sleep can happen because a bedroom is too warm, bedding is heavy, or a person has a temporary infection.
But repeated episodes of drenching night sweats without an obvious explanation deserve attention.
Possible causes include:
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Infections.
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Hormonal changes, including menopause.
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Certain medications.
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Thyroid disorders.
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Sleep-related conditions.
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Less commonly, certain cancers.
A persistent fever, unexplained weight loss, swollen lymph nodes, or prolonged fatigue occurring alongside night sweats should be evaluated.
It is important to remember that night sweats are common and usually have causes other than cancer.
The purpose of recognizing this symptom is not to create fear, but to identify situations in which medical assessment may be appropriate.
43. Swollen Lymph Nodes: When Should You See a Doctor?
Lymph nodes are small structures that help the immune system recognize and respond to infections.
They are found in areas such as the neck, armpits, and groin.
When the body fights an infection, lymph nodes may become enlarged or tender. This commonly occurs with sore throats, dental infections, and viral illnesses.
In many cases, the swelling gradually disappears as the infection improves.
However, medical evaluation is advisable when a lymph node:
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Continues to enlarge.
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Remains swollen for several weeks without a clear cause.
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Feels hard or fixed in place.
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Is accompanied by unexplained fever or night sweats.
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Occurs alongside unexplained weight loss.
The size, location, texture, duration, and accompanying symptoms all help determine whether further investigation is needed.
Do not repeatedly press or massage a swollen lymph node. This will not make the underlying cause disappear and may increase local irritation.
44. How to Recognize a Medical Emergency
Learning to recognize warning signs is important, but it is equally important to know when not to wait for a routine appointment.
Some symptoms may indicate a life-threatening condition and require emergency medical care.
Possible stroke
Remember the FAST approach:
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F – Face: One side of the face droops.
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A – Arms: One arm becomes weak or difficult to raise.
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S – Speech: Speech becomes slurred or difficult to understand.
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T – Time: Call emergency services immediately.
Other sudden symptoms, including loss of vision, severe imbalance, or confusion, can also indicate stroke.
Possible heart attack
Warning signs can include chest pressure or discomfort, pain spreading to the arm, back, neck, jaw, or stomach, shortness of breath, cold sweating, nausea, and lightheadedness.
Not everyone experiences the same symptoms. Some people, including older adults and people with diabetes, may have less typical presentations.
Severe breathing problems
Sudden difficulty breathing, blue or gray lips, fainting, or severe chest pain requires emergency attention.
Severe allergic reactions
Swelling of the tongue or throat, difficulty breathing, faintness, or rapidly worsening symptoms after exposure to an allergen may indicate anaphylaxis.
Severe bleeding
Uncontrolled bleeding, vomiting blood, or black, tarry stools with weakness or dizziness requires urgent assessment.
When a serious emergency is suspected, contact local emergency services. In Vietnam, the medical emergency ambulance number is 115.
Do not delay emergency care while searching online for explanations.
45. How to Monitor Your Health Without Becoming Anxious
Being aware of your body is valuable, but constantly checking every sensation can create unnecessary anxiety.
The goal is to recognize meaningful changes, not to interpret every headache, stomach noise, or episode of tiredness as a serious disease.
A practical approach is to focus on patterns.
Notice what is different.
Ask yourself whether a symptom is new, unusual, persistent, or becoming more severe.
Consider the circumstances.
Have you slept poorly? Changed your diet? Started a new medication? Increased your exercise? Experienced unusual stress?
These factors may help explain temporary symptoms.
Record important changes.
A simple health diary can help track symptoms over time.
You might record:
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When the symptom started.
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How often it occurs.
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How long it lasts.
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Whether it is improving or worsening.
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What makes it better or worse.
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Any other symptoms that occur at the same time.
Avoid self-diagnosis.
Online searches can provide useful general information, but they cannot replace a medical examination.
Several different conditions can produce the same symptom. A headache, for example, does not automatically indicate a neurological disease.
Seek care when appropriate.
If a symptom persists, worsens, repeatedly returns, or affects daily activities, arrange a medical assessment.
This balanced approach helps people remain informed without becoming unnecessarily frightened.
46. Why Regular Health Checkups Matter Even When You Feel Fine
One of the most important lessons in preventive healthcare is that not every health problem produces obvious symptoms.
High blood pressure, high cholesterol, early diabetes, and some cancers may develop quietly.