With fluid building up in the body, weight gain become inevitable. Weight gain can be an important tool to report back to your doctor with your progress. Tracking your weight each day allows you to determine the levels of fluid accumulating in the body. Fluid accumulation is different from normal weight gain from consuming a surplus of calories. Weight gain from fluid accumulation will likely fluctuate quite rapidity for people who are experiencing heart failure. Bloating can also be another symptom associated with excess fluid building up in the body.