Flu, Cold or COVID? How to Identify Your Symptoms During Riyadh’s Flu Season

You wake up with a sore throat. A few hours later, a headache starts, and suddenly your whole body feels heavier than usual. That is when the familiar seasonal question comes up:

Is it just a common cold, the flu, or COVID?

It sounds like a simple question, but the answer is not always straightforward.

Flu, the common cold, and COVID-19 are respiratory illnesses that can share symptoms such as cough, nasal congestion, sore throat, and fatigue. During flu season, relying on symptoms alone can make things even more confusing.

There are, however, some patterns that can help you understand what is more likely. More importantly, it helps to know when monitoring your symptoms may be enough and when you may need a doctor consultation or a lab test in Riyadh.

First: What Is the Difference Between a Cold and the Flu?

One of the most useful clues is to ask yourself:

How did the symptoms begin?

A cold usually develops gradually. You may first notice a mild scratchy throat, followed by sneezing, a runny or blocked nose, and perhaps a mild cough.

The flu, on the other hand, often comes on more suddenly.

You may feel fine in the morning and then, within a few hours, develop noticeable fatigue, body aches, headache, chills, and cough. Fever is also more common with the flu than with a cold, but not having a fever does not rule out influenza.

According to the Centers for Disease Control and Prevention (CDC), sneezing, nasal congestion, and sore throat are more common with colds, while the flu is more likely to cause prominent body aches, headache, and fatigue. This is also consistent with guidance from the Saudi Ministry of Health, which notes that cold and seasonal flu symptoms can overlap, but flu symptoms are generally more severe.

Cold Symptoms: Uncomfortable, but Usually Milder

The common cold is a viral infection of the upper respiratory tract and can be caused by many different viruses.

The pattern is usually familiar: a runny or blocked nose, sneezing, sore throat, cough, and sometimes a headache or mild body aches. If fever occurs in adults or older children, it is usually lower than the fever that may occur with influenza.

So, if your main symptoms are nasal congestion, sneezing, and a sore throat with relatively mild overall symptoms, a cold may be more likely.

But “more likely” is the key phrase here. Symptoms alone do not provide a definite diagnosis.

Flu Symptoms: When Your Whole Body Feels Unwell

The flu is not simply “a bad cold.”

It is a respiratory illness caused by influenza viruses, and its symptoms often begin suddenly. Common symptoms include fever or chills, cough, sore throat, headache, fatigue, muscle aches, and body pain. A runny or blocked nose may also occur.

A common misconception is that you cannot have the flu without a fever. In fact, influenza can occur without fever.

For most people without complications, the main symptoms improve over several days, although cough and fatigue may last longer.

What About COVID-19?

This is where the distinction becomes more difficult.

COVID-19 can cause fever or chills, cough, sore throat, a blocked or runny nose, fatigue, headache, body aches, and shortness of breath. Some people may also experience gastrointestinal symptoms such as nausea, vomiting, or diarrhea.

Loss or changes in smell and taste can also occur and have been associated more strongly with COVID than with the flu, although they are not present in every case. COVID symptoms can also vary depending on the circulating variant and a person’s vaccination status.

This brings us to one of the most important points in the article:

There is no set of symptoms that allows you to say with certainty, “This is flu, not COVID.”

The overlap is significant enough that the CDC confirms that flu and COVID-19 cannot reliably be distinguished based on symptoms alone. Testing may be needed to identify which virus is causing the illness.

How Can You Tell Whether Your Symptoms Are a Cold, Flu, or COVID?

Instead of trying to diagnose yourself from one symptom, look at the overall pattern.

If symptoms came on gradually and sneezing, congestion, and a runny nose are the main problems, a cold may be more likely.

If symptoms appeared quickly and you have clear body aches, fatigue, headache, chills, or fever, the flu may be more likely.

If your symptoms resemble either the flu or a cold, COVID cannot be ruled out based on how you feel alone. In this case, testing can be more useful, especially if knowing the cause would affect your treatment or how you interact with people around you.

Symptoms can give clues, but they are not a diagnostic test.

Can the Color of Nasal Mucus Tell You What You Have?

Not really.

The thickness and color of nasal mucus can change during a respiratory infection, but trying to determine whether you have the flu, a cold, or another infection based on mucus color alone is not a reliable way to diagnose the cause.

It is more useful to look at how long the symptoms have lasted, how severe they are, how they started, and whether they are improving or getting worse, alongside a medical assessment when needed.

When Do You Need a Lab Test in Riyadh?

Not every cough or runny nose needs a test.

In many mild cases, a doctor may decide that testing is unnecessary. However, a lab test in Riyadh can be useful when symptoms overlap and the cause is unclear, or when the result may affect a treatment decision.

This is particularly important for people at higher risk of severe complications, because identifying the cause early may help the doctor choose the most appropriate treatment at the right time.

Several tests can detect respiratory viruses, including rapid tests and more accurate tests such as PCR. The right test depends on your symptoms, your condition, and your doctor’s recommendation.

There are also multiplex tests that can detect influenza and SARS-CoV-2, the virus that causes COVID-19, from the same sample. This can help distinguish between the two infections.

If a Rapid Test Is Negative, Does That Mean I Am Not Infected?

Not necessarily.

A negative result does not always mean there is no infection, especially with some rapid virus tests that are less sensitive than molecular tests.

For example, the CDC notes that a person can still have influenza despite a negative rapid flu test. Likewise, a negative COVID antigen test does not completely rule out infection.

If your symptoms are severe or persistent, or if you are at higher risk of complications, it is better not to treat one negative rapid test as the final answer. Speak with a doctor, who can decide whether you need repeat testing or a different type of test.

When Is a Doctor Consultation More Important Than Trying to Figure It Out Yourself?

If your symptoms are mild and improving, you may not need to see a doctor every time you develop a cold.

A doctor consultation becomes more important if your symptoms are severe, unusual, getting worse instead of better, or if they improve and then return more strongly.

It is also worth contacting a doctor early if you are at higher risk of flu complications, including older adults, pregnant women, young children, and some people with chronic health conditions.

One reason not to wait too long in higher-risk groups is that some antiviral treatments work best when started early. Your doctor can decide whether they are appropriate for your case.

When Should You Not Wait?

Some symptoms go beyond the question of “Is this flu or COVID?” and require urgent medical evaluation.

Difficulty breathing or shortness of breath, persistent chest pain or pressure, new confusion, or difficulty waking or staying awake are warning signs that require urgent medical attention.

A clear worsening of symptoms, or fever or cough that returns and becomes worse after an initial improvement, should also be medically assessed.

What Should You Do When Symptoms Start?

When a sore throat, cough, or fever begins, try not to dismiss it immediately as “just a cold” and carry on as usual.

Monitor your symptoms, rest, stay well hydrated, and limit close contact with others while you are unwell to reduce the chance of spreading infection.

If you are not sure what you have, if the symptoms are severe, or if you are at higher risk of complications, a doctor consultation is more useful than guessing.

In Riyadh, home healthcare services can also help you access medical advice and appropriate lab testing based on your condition, without undergoing unnecessary tests you may not need.

The goal is not to test every time you sneeze.

The goal is to know when testing actually matters, when you need a doctor, and when your body simply needs rest and recovery.

In Summary

After all of that, it can be helpful to see the main differences in one place. The table below is not a diagnostic tool. It is simply a brief summary of the most common patterns to help you understand your symptoms and decide on the next step.

In the end, you do not need to know the name of the virus after the first sneeze. What matters is paying attention to what your body is telling you.

If symptoms are mild and improving, rest and monitoring may be enough. But if they become more severe, persist, or you are at higher risk of complications, do not rely on guesswork.

A doctor consultation and lab testing when needed can help reduce uncertainty and guide you toward the safest next step for recovery.

Medically Reviewed By: Dr. Rayan Mohammed, General Practitioner at Valeo Health 
Reviewed for medical accuracy, safety guidelines, and healthcare recommendations.