Feeling worn out, noticing swelling in your legs or around your eyes, having a hard time focusing, or seeing foamy urine can be unsettling. Many conditions can cause these symptoms, but your kidneys often sit near the center of the picture. The good news is that simple tests usually point us in the right direction. With timely care and clear guidance, most people find answers and a plan.
At Kidney Hypertension Transplant Specialists (KHS) in San Antonio and Devine, our board-certified nephrologists listen first, then tailor a stepwise workup. Kidney care, with beyond passion. Our priority is you and your family, with personalized plans and a friendly team that walks beside you from first symptoms to steady follow up.
How kidney issues can cause these symptoms
Fatigue that will not lift can be tied to anemia in chronic kidney disease (CKD). Healthy kidneys help make erythropoietin (EPO), a hormone that signals your bone marrow to produce red blood cells. When kidney function falls, EPO can drop, leading to low hemoglobin and oxygen-carrying capacity. The result is tiredness, shortness of breath on exertion, and reduced exercise tolerance. Iron deficiency, inflammation, or blood loss can add to the picture.
Swelling in the legs, feet, or around the eyes, called edema, often reflects extra fluid and sodium your kidneys cannot balance normally. This is common in CKD and can appear rapidly in acute kidney injury (AKI). You might notice shoes feeling tight by evening or puffiness on waking.
Brain fog and trouble concentrating can arise when waste products that healthy kidneys clear start to build up in the blood, a state called uremia. Sleep disruption from nocturia, anemia, blood pressure swings, and medication side effects can layer on and magnify cognitive symptoms.
Foamy or bubbly urine can signal protein in the urine, also called albuminuria or proteinuria. Sustained protein loss often means glomeruli, the kidney’s filters, are inflamed or leaking. Mild foam can occur with fast urination or concentrated urine, so persistence over days to weeks is more concerning than a single episode.
Not everything is the kidneys, and that is important
Several conditions can mimic renal symptoms:
- Dehydration can cause fatigue, dizziness, and dark, more bubbly urine from concentration.
- Heart or liver disease can trigger leg and belly swelling due to fluid shifts.
- Uncontrolled diabetes can drive frequent urination, thirst, fatigue, and later kidney changes.
- Medications like NSAIDs, some antibiotics, and contrast dyes can injure kidneys or promote fluid retention.
- Thyroid disorders, depression, and poor sleep can cause brain fog and tiredness.
Sorting causes early prevents harm. We look at the whole person, not a single symptom.
When to call a nephrologist
Call promptly if you have any of the following:
- Swelling that is new, worsening, or associated with shortness of breath or chest discomfort.
- Foamy urine that persists beyond several days, visible blood in urine, or a sharp drop in urine output.
- Fatigue with dizziness, pale skin, or rapid heartbeat that could suggest anemia.
- Brain fog with confusion, severe headache, or uncontrolled high blood pressure.
If you already know you have diabetes, hypertension, or CKD, contact us sooner for any change in energy, swelling, or urine appearance. Early referral often prevents progression and reduces hospitalizations. For convenient access to comprehensive care with board-certified San Antonio kidney doctors and coordinated testing, see our overview of services by our nephrologists in San Antonio.
What tests check if the kidneys are involved
A focused evaluation typically includes:
- Blood tests: creatinine and estimated glomerular filtration rate (eGFR) to gauge kidney function; electrolytes, including sodium and potassium; hemoglobin and iron studies if fatigue is present.
- Urine tests: dipstick and albumin-to-creatinine ratio (ACR) to check for protein or blood; microscopy when indicated.
- Blood pressure: both in office and at home. We often recommend morning and evening readings for several days.
- Imaging: kidney ultrasound to review size, structure, and any obstruction if labs are abnormal or symptoms persist.
- Occasionally, additional tests: glucose and A1C for diabetes screening, thyroid panel, and review of medicines and supplements that can affect kidneys.
Trends matter. A single creatinine is a snapshot. A series of eGFR and ACR results shows the movie.
Practical steps you can start today
- Hydration: aim for steady, moderate fluid intake unless your clinician has given a restriction. In illness with vomiting or diarrhea, call us to review temporary medication holds to protect your kidneys.
- Sodium: reduce salt to help control blood pressure and swelling. Choose fresh foods, rinse canned items, and favor spices, citrus, and herbs instead of salty mixes.
- Medication safety: avoid unnecessary NSAIDs like ibuprofen unless your doctor approves. Share a full list of prescriptions, over-the-counter medicines, and supplements at your visit.
Nutrition is not one size fits all. If labs show albuminuria, swelling, or potassium shifts, our renal dietitians create practical meal plans and label-reading strategies tailored to your culture and preferences. For personalized guidance on sodium, phosphorus, and fluids, explore our renal nutrition resources for Castle Hills residents, including a kidney diet plan in Castle Hills.
How KHS helps diagnose and treat these symptoms
We start with your story and a hands-on exam. Our team orders targeted labs and urine tests, interprets results in context, and builds a plan that can include:
- Anemia management: iron repletion when indicated and, if needed, erythropoiesis-stimulating therapy with careful monitoring. Learn more about our approach to anemia management in CKD in San Antonio.
- Edema control: sodium guidance, diuretics when appropriate, and blood pressure optimization.
- Proteinuria reduction: ACE inhibitor or ARB therapy when suitable, paired with lifestyle and diabetes control.
- AKI care: quick identification of the cause, medication adjustments, hydration strategy, and close follow up.
- Education and support: home blood pressure technique, sick-day rules, and tele-visits when appropriate.
When advanced therapies are needed, we coordinate seamlessly. If dialysis ever becomes part of your journey, we help you weigh options and prepare access thoughtfully, including peritoneal dialysis education and support. For modality education and a caring setting if dialysis is required, see our dialysis clinic in San Antonio.
Kidney care, with beyond passion. Three locations for your convenience, same- or next-week appointments in most cases, and a team that answers questions in plain language.
FAQ: quick answers to common questions
- Can kidney problems cause fatigue? Yes. CKD can reduce EPO production and cause anemia, leading to tiredness. Electrolyte imbalances, high uremic toxins, and poor sleep can add to fatigue.
- Do kidney issues cause swelling? Yes. Sodium and water retention from reduced kidney function can cause leg and eyelid swelling, sometimes with rapid weight gain.
- Can kidney disease lead to brain fog? Yes. Uremia, anemia, blood pressure variability, and sleep disruption can impair focus and memory.
- What does foamy urine mean? It can signal protein in the urine from a damaged filter. Occasional foam can be normal, but persistent foam deserves a urine test.
- When should I see a nephrologist? If you have persistent swelling, foamy urine, changes in urine output, uncontrolled blood pressure, or fatigue with anemia, schedule a visit. People with diabetes or hypertension benefit from earlier referral.
- What tests check for kidney disease? Creatinine and eGFR, electrolytes, hemoglobin and iron studies, urine ACR and dipstick, blood pressure monitoring, and kidney ultrasound when indicated.
Your next step
If these symptoms ring a bell, do not wait for clarity to arrive on its own. Call 210-277-1418 or request a visit so we can check labs, review medications, and create a personalized plan that fits your life. Kidney care, with beyond passion, means we listen, educate, and walk beside you from first symptoms to answers. To get started with a comprehensive nephrology consultation in San Antonio or to meet a nephrologist in Alamo Heights, see our complete care page and local provider information.