The 34-year-old Costa was admitted to a hospital near Barcelona after complaining of heart palpitations, chest pains and hypertension, the Spanish tennis federation said. He was released hours later and was at home resting.
In his first year as captain, Costa led Spain to its fourth Davis Cup title with a 5-0 sweep of the Czech Republic last Sunday.
Story continues below ↓advertisement | your ad hereCosta had no such related medical problems in the past, federation spokesman Pedro Hernandez said. Hernandez put the episode down to stress.
Costa, who replaced Emilio Sanchez Vicario after last year's triumph over Argentina, said after the victory that he would soon sit down with the federation to discuss his contract renewal. Costa also currently works as sporting director of the Catalan tennis federation.
Costa was expected to be at the national tennis championships in Seville as tournament director from Friday, but that was now unlikely.
Costa played in Spain's first Davis Cup-winning team in 2000. He won the French Open two years later.
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Nadal officially picked for Davis Cup finalCosta earns new contract
