Always Tired? Fatigue Causes to Check Before IV Vitamins
“I just want my energy back” is one of the most common reasons people ask about IV vitamins. Fatigue is real and draining, and a drip can feel like a quick way to recharge. But persistent tiredness usually has a cause, and finding it often matters far more than any infusion. Here are the causes worth checking first.
Short answer: if you have felt tired for more than a few weeks, start with a clinical assessment and blood work. Common, treatable causes include iron deficiency, low vitamin B12, thyroid problems, low vitamin D, poor sleep or sleep apnea, depression or anxiety, blood sugar problems and medication side effects. IV vitamins can be supportive, but they are not a substitute for finding the reason.
Common medical causes of fatigue
Iron deficiency
One of the most common and most overlooked causes, especially in people with heavy periods, pregnancy or recent childbirth, endurance athletes and those on plant-based diets. Ferritin, a measure of stored iron, can be low long before anemia appears. Read low ferritin and iron deficiency and heavy periods and low iron.
Low vitamin B12
More common with age, plant-based diets, metformin and acid-reducing medications. It can cause tiredness, tingling and memory problems. See B vitamins by IV versus by mouth.
Thyroid problems
An underactive thyroid can cause fatigue, weight gain, feeling cold, constipation and dry skin. A simple blood test (TSH) screens for it.
Low vitamin D
Common in Canadian winters. Its link with fatigue is less clear than iron or B12, but it is worth correcting if low.
Blood sugar
Diabetes and prediabetes can cause tiredness, thirst and frequent urination.
Other conditions
Kidney or liver problems, heart conditions, celiac disease, infections, menopause and long COVID can all play a role. Medications, including some blood pressure pills, antihistamines and antidepressants, can also cause drowsiness.
Sleep and mental health
- Sleep quantity and quality. Many adults simply do not get seven to nine hours.
- Sleep apnea. Loud snoring, gasping at night, morning headaches and daytime sleepiness are clues. It is common and treatable.
- Depression and anxiety. Both can cause profound tiredness, poor sleep and low motivation.
- Burnout and stress. Long periods of pressure take a physical toll.
Lifestyle factors
- Skipping meals or eating very little protein
- Not drinking enough water
- High caffeine intake, which disrupts sleep
- Alcohol, even in moderate amounts
- Too little movement, or overtraining without recovery
Tests your clinician may suggest
Depending on your history: a complete blood count, ferritin, vitamin B12, TSH, blood sugar or HbA1c, kidney and liver function, and sometimes vitamin D. Our Nurse Practitioners can assess your symptoms and arrange blood work by appointment.
Warning signs to act on promptly
See a clinician soon if fatigue comes with unexplained weight loss, fever or night sweats, shortness of breath or chest pain, blood in stool or very heavy bleeding, a new lump, or thoughts of self-harm. In an emergency, call 911.
Where IV therapy fits
Once serious causes are ruled out or being treated, some people choose an IV drip as a supportive part of their plan, for example a Myers’-type drip during a demanding stretch. If blood work shows iron deficiency, an iron infusion may be appropriate when tablets have not worked. For a whole-person approach to diet, stress and sleep, our naturopathic doctor can work alongside your Nurse Practitioner.
Also worth reading: how often you can safely get IV therapy and IV vitamins versus oral supplements.
Preparing for a fatigue appointment, step by step
Fatigue has many possible causes, so the more information you bring, the more useful your first visit will be.
- Keep a two-week log. Note when you go to bed and wake up, how rested you feel, your energy across the day, caffeine and alcohol, exercise and your mood.
- List every medication and supplement. Antihistamines, some blood pressure medicines, sleep aids and certain antidepressants can all add to tiredness.
- Note other symptoms. Shortness of breath, hair loss, feeling cold, heavy periods, weight changes, snoring or low mood can point toward a specific cause.
- Bring past results. Previous blood work helps show trends, such as ferritin that has been slowly falling.
- Write down your main question. For example: Is something medical going on, or do I need to change how I live?
Who may consider an IV drip for low energy, and who should wait
When a drip may fit
Once common medical causes have been checked, some people use a hydration or vitamin drip as one part of a broader plan, for example during a demanding season at work, after an illness, or alongside changes to sleep and nutrition. The aim is support, not a replacement for finding and treating the cause.
When to wait or choose another path
- You have not had any blood work yet. Testing comes first.
- You have low iron. That usually needs iron itself, by mouth or by infusion, not a vitamin drip.
- Your fatigue comes with warning signs such as unexplained weight loss, fever, night sweats, chest pain or breathlessness.
- You have heart or kidney disease and fluid needs to be managed carefully.
- Your tiredness is mostly linked to low mood, anxiety or poor sleep, which respond better to direct care.
Questions to ask your clinician about fatigue
- Which tests make sense for my symptoms, and which do not?
- Could any of my medications be adding to my tiredness?
- Should my sleep be assessed for problems such as sleep apnea?
- If my results are normal, what are the next steps?
- When should we review how I am feeling?
What the research does not cover yet
Many people with long-lasting fatigue never get a single clear diagnosis, and studies on wellness drips for general tiredness are small and short. That makes a step-by-step approach important: rule out treatable causes, build the basics, and review progress honestly.
If testing shows low iron, our guide to iron infusion versus iron pills explains the options. If your results are normal and you are weighing a drip, Myers’ cocktail versus a hydration drip compares the two. Patients from Woodbridge, Vaughan and Richmond Hill can have the assessment, blood work requisition and follow-up with the same nurse practitioner-led team.
Related care at AuraWell
Tired of being tired? Call 905-207-7000 to book an assessment at AuraWell Health, 4600 Hwy 7, Unit 105, Woodbridge, ON L4L 4Y7, serving Vaughan and Richmond Hill.
Frequently asked questions
What blood tests check for fatigue?
Common ones include a complete blood count, ferritin, vitamin B12, TSH, blood sugar and kidney and liver function, chosen based on your history.
Can low iron cause fatigue without anemia?
Yes. Low ferritin can cause tiredness even when hemoglobin is still normal.
Will an IV drip fix my fatigue?
Not if there is an underlying cause. A drip can be supportive, but finding the reason comes first.
Do I need a referral for blood work at AuraWell?
No. Book an appointment with one of our Nurse Practitioners by calling 905-207-7000.
